If there is straight line on speed time graph, which of the following statements best describes A)the body is travelling at a constant speed. B) the body is slowing down. C)the body is accelerating. D) the body is stopped​

Electron initially had zero momentum. After colliding with a photon, it gained momentum due to the transfer of momentum. This demonstrates the wave-particle duality of light.

a.  Yes, the electron has momentum after being hit by the light particle. This is because momentum is defined as the product of mass and velocity, and even though electrons are very small in mass, they still have mass and can therefore have momentum. In this case, the photon (light particle) transferred some of its momentum to the electron, causing it to move.

b.  Yes, the electron has momentum and is moving after being hit by the light particle. As mentioned in the previous paragraph, the photon transferred some of its momentum to the electron, causing it to move.

c.  Based on the fact that the electron received its velocity from the photon, we can infer that light particles also have momentum. In fact, it was later discovered that photons have both momentum and energy, even though they have no mass. This is because photons are made up of electromagnetic waves, which have both electric and magnetic fields that can transfer energy and momentum.

So, when a photon hits an electron, it can transfer some of its momentum to the electron and cause it to move. This concept is known as the wave-particle duality of light, where light can behave as both a wave and a particle.

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Hunter had a power of 40 watts when he pushed the couch across the room.

To solve this problem, we need to use the formula for power, which is P = W/t, where P is power measured in watts, W is work measured in joules, and t is time measured in seconds.

Given that Hunter did 800 J of work in 20 seconds, we can calculate his power as follows:

P = W/t
P = 800 J / 20 s
P = 40 W

Therefore, Hunter had a power of 40 watts when he pushed the couch across the room.

It's important to note that power is a measure of how quickly work is done. In this case, Hunter did 800 J of work in 20 seconds, which means he was doing work at a rate of 40 J/s (or 40 watts). His power would have been greater if he had done the same amount of work in less time. Conversely, his power would have been lower if he had taken longer to do the work.

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Answer: Specular and Diffuse reflection

Explanation: I'm assuming this is what you need. Specular is light reflected from a smooth surface at an angle. Diffuse is related to rough surfaces, generally, light is reflected in all directions with diffuse reflection

Answer:D. The magnetic field would increase.

Explanation:

A horse pulls a barge along a canal by means of a rope. The force on the barge from the rope has a magnitude of 7890 N and is at the angle θ = 13° from the barge's motion, which is in the positive direction of an x axis extending along the canal. The mass of the barge is 9500 kg, and the magnitude of its acceleration is 0. 12 m/[tex]s^{2}[/tex]. 7890 N is the magnitude of the force and its direction (measured from the positive direction of the x axis) is 103°.

a. To solve this problem, we need to use Newton's second law, which states that the net force acting on an object is equal to the product of its mass and acceleration

Fnet = m*a.

We can start by finding the net force acting on the barge, which is the force of the rope pulling it forward minus the force of the water pushing against it. Since the barge is moving at a constant speed, the net force must be zero. Thus, we have

Frope - Fwater = 0

Solving for Fwater, we get

Fwater = Frope = 7890 N

This is the magnitude of the force on the barge from the water.

b. To find the direction of this force, we need to use trigonometry. Let's call the angle between the force of the rope and the positive x axis φ. Then we have

φ = 90° - θ = 90° - 13° = 77°

This means that the force of the rope makes an angle of 77° with the negative x axis. Since the net force is zero, the force of the water must make an angle of 180° - 77° = 103° with the negative x axis.

Therefore, the magnitude of the force on the barge from the water is 7890 N and its direction (measured from the positive direction of the x axis) is 103°.

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It was important for Dr. Jeff to use a large ball to represent the sun because the sun is much larger than the earth and the moon. Similarly, using a marble to represent the earth and a bead to represent the moon accurately represents their relative sizes in comparison to the sun. This helps to provide a visual representation that accurately depicts the sizes of the celestial bodies in question, which is important when teaching and understanding astronomical concepts.

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Two other factors that affect the braking distance of a car are the condition of the road surface and the condition of the brakes.

On a wet or icy road, the braking distance will be longer compared to a dry road as the tires have less grip.

Similarly, if the brakes are worn out or not properly maintained, the braking distance will increase.

This is because the brakes will not be able to apply enough force to the wheels to slow down the car effectively.

Therefore, it is important to ensure that the brakes are well maintained and the tires are appropriate for the road conditions to reduce the braking distance and avoid accidents.

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The net force has a magnitude of C, 5.0 N.

To find the net force, add the two forces vectorially. Break down each force into its x and y components:

F₁ = (2.01 N)î + (4.03 N)ĵ

F₂ = (3.01 N)î + (6.01 N)ĵ

To find the net force, add the components:

F_net = F₁ + F₂ = (2.01 N + 3.01 N)î + (4.03 N + 6.01 N)ĵ

F_net = 5.02î + 10.04ĵ

The magnitude of the net force is given by:

|F_net| = √((5.02 N)² + (10.04 N)²)

|F_net| = √(25.2004 N²)

|F_net| = 5.02 N (rounded to two decimal places)

Therefore, the magnitude of the net force is 5.0 N.

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The freezing method works by exploiting the difference in freezing points between engine oil and water. However, its effectiveness may vary depending on the properties and composition of the mixture.

The freezing method for separating engine oil from water is based on the difference in freezing points between the two substances. Water has a higher freezing point than most engine oils, which means that when a mixture of oil and water is cooled to a temperature below the freezing point of water, the water will freeze while the oil remains in liquid form.

To use this method, the mixture is first placed in a container and then put in a freezer or other cooling device. As the temperature drops, the water in the mixture will begin to freeze, forming ice crystals. These can then be removed by either skimming them off the surface or pouring off the liquid oil, which should be separated from the frozen water.

It's worth noting that this method is not always effective, as some engine oils may have a higher freezing point than water, making it difficult to separate them using this technique. Additionally, it may not be suitable for larger quantities of oil and water or for more complex mixtures containing other substances.

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The work function of caesium being 3.0 x 10^-19 J means that to remove an electron from the surface of caesium, at least 3.0 x 10^-19 J of energy must be supplied to that electron.

The work function of a metal refers to the minimum amount of energy required to remove an electron from the surface of that metal. It is the energy required to overcome the attractive forces between the electron and the metal surface. The work function is usually denoted by the symbol Φ, and its unit is joules (J).

In the case of caesium, the work function is 3.0 x 10^-19 J. This means that to remove an electron from the surface of caesium, at least 3.0 x 10^-19 J of energy must be supplied to that electron.

To calculate the frequency of radiation needed to eject electrons of maximum kinetic energy 6.0 x 10^-19 J from a caesium surface, we can use the formula:

maximum kinetic energy = hf - Φ

where h is Planck's constant (6.626 x 10^-34 J s), f is the frequency of the radiation, and Φ is the work function.

If we rearrange this formula to solve for the frequency f, we get:

f = (maximum kinetic energy + Φ) / h

Substituting the given values, we get:

f = (6.0 x 10^-19 J + 3.0 x 10^-19 J) / (6.626 x 10^-34 J s)

f = 7.57 x 10^14 Hz

Therefore, the frequency of radiation needed to eject electrons of maximum kinetic energy 6.0 x 10^-19 J from a caesium surface is 7.57 x 10^14 Hz.

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The distance between the golf tube and the balloon is approximately 53.9 millimeters.

To solve this problem, we can use Coulomb's Law, which states that the electrical force (F) between two charges (q1 and q2) is proportional to the product of their charges divided by the square of the distance (r) between them:

F = k * (q1 * q2) / r²

where k is Coulomb's constant, approximately 8.99 x 10^9 Nm²/C².

In this case, the electrical force (F) is -1.0 x 10^-5 N, the charge of the balloon (q1) is -1.0 x 10^-6 C, and the charge of the plastic golf tube (q2) is +4.0 x 10^-6 C. We want to find the distance (r) between them.

First, let's rearrange the formula to solve for r:

r = √(k * (q1 * q2) / F)

Now, substitute the given values into the equation:

r = √((8.99 x 10^9 Nm²/C²) * (-1.0 x 10^-6 C) * (4.0 x 10^-6 C) / (-1.0 x 10^-5 N))

Solve for r:

r ≈ 0.0539 meters or 53.9 millimeters

So, the distance between the golf tube and the balloon is approximately 53.9 millimeters.

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The force exerted by the puck on the block depends on the rate of change of momentum during the collision.

To determine the scenario in which the puck exerts the most force on the block, we need to consider the principles of conservation of momentum.

The momentum of an object is defined as the product of its mass and velocity.

According to the law of conservation of momentum, the total momentum before the collision is equal to the total momentum after the collision, assuming no external forces are acting on the system.

Let's consider two scenarios:

Scenario 1: The puck approaches the block with a higher initial velocity.

Scenario 2: The puck approaches the block with a lower initial velocity.

In both scenarios, the mass of the puck and the block remains constant.

However, the difference lies in the initial velocity of the puck.

According to the conservation of momentum, the change in momentum of the puck must be equal and opposite to the change in momentum of the block.

If the initial momentum of the puck is greater in scenario 1 compared to scenario 2, the change in momentum will also be greater.

Since force is defined as the rate of change of momentum, a greater change in momentum implies a larger force.

Hence, in scenario 1 where the puck has a higher initial velocity, the puck will exert more force on the block during the collision.

To summarize, the puck exerts the most force on the block when it approaches the block with a higher initial velocity (scenario 1).

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The tension in the left chain is 500 N, which is equal to the weight of the person on the board. Since the board is in equilibrium, the net force and net torque acting on the board must be zero.

Let's consider the forces acting on the board: the weight of the board (125 N) acts downward, the weight of the person (500 N) acts downward at the center of the board, and the tension in each chain acts upward.

Since the tension in the right chain is given to be 125 N, the total upward force acting on the board is 125 N + T (where T is the tension in the left chain).

Therefore, the net force on the board is 125 N + T - 625 N = 0 (where 625 N is the combined weight of the board and person).

Solving for T, we get T = 500 N, which is the tension in the left chain. So the tension in the left chain is 500 N, which is equal to the weight of the person on the board.

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The torque required for the sphere with the smaller radius is approximately 0.622 N*m.

To find the torque required for each sphere, we need to first calculate the moment of inertia (I) for each sphere, and then use the formula for torque (τ) which is τ = I * α, where α is the angular acceleration.

The moment of inertia for a solid sphere is given by I = (2/5) * M * R^2, where M is the mass and R is the radius.

For the smaller sphere (radius = 0.206 m):
I₁ = (2/5) * 1.75 kg * (0.206 m)^2 ≈ 0.0295 kg*m^2

For the larger sphere (radius = 0.834 m):
I₂ = (2/5) * 1.75 kg * (0.834 m)^2 ≈ 0.5093 kg*m^2

Next, we need to find the angular acceleration (α) using the formula α = Δω/Δt, where Δω is the change in angular velocity and Δt is the time interval.

Δω = 327 rad/s (final angular velocity) - 0 rad/s (initial angular velocity) = 327 rad/s
Δt = 15.5 s

α = 327 rad/s / 15.5 s ≈ 21.1 rad/s^2

Now, we can find the torque (τ) for each sphere using τ = I * α.

Torque for smaller sphere:
τ₁ = 0.0295 kg*m^2 * 21.1 rad/s^2 ≈ 0.622 N*m

Torque for larger sphere:
τ₂ = 0.5093 kg*m^2 * 21.1 rad/s^2 ≈ 10.76 N*m

So, the torque required for the sphere with the smaller radius is approximately 0.622 N*m.

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Answer:

a. The two balloons will repel

Explanation:

when stephen rubs the balloon on his head, the balloon collects a negative charge. this will happen to both balloons and because the balloons are both negatively charged they will repel

The work done in pushing the 80 kg box 2 meters across the surface with a 1400 N force applied parallel to the surface is 2800 Joules.

To find the work done, we need to consider the force applied, the displacement, and the angle between them.

In this case, the force (F) applied is 1400 N, the displacement (d) is 2 meters, and since the force is applied parallel to the horizontal surface, the angle (θ) between the force and the displacement is 0 degrees. The formula to calculate work (W) is:

W = F × d × cos(θ)

Now, let's substitute the given values:

W = 1400 N × 2 m × cos(0°)

Since cos(0°) = 1, the equation becomes:

W = 1400 N × 2 m × 1

W = 2800 J (Joules)

So, the work done in pushing the 80 kg box 2 meters across the surface with a 1400 N force applied parallel to the surface is 2800 Joules.

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Surfing purists dislike aerial moves in competitions, preferring traditional surfing. There is controversy over the emphasis on aerial moves, and diversity of opinion within the community.

The surfing "purists" are likely to be critical of the movement towards incorporating aerial moves into surfing competitions, as they are described as valuing "traditional" or "classic" surfing.

The text notes that these purists "feel that aerial moves represent a departure from classic surfing," and quotes a professional surfer who suggests that "real surfing is all about turns and the flow of the wave."

The article also notes that there is some controversy within the surfing community over the emphasis on aerial moves, with some feeling that it has become too dominant in competitions. This further suggests that there are those within the community who are resistant to this trend.

Overall, it seems that the surfing "purists" value a more traditional, flowing style of surfing and may view aerial moves as a departure from this style.

However, it is important to note that there is diversity of opinion within the surfing community, and not all surfers or fans may share this view.

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The magnitude of Coulombic force between the two balloons is [tex]3.17 *10^{-4} N[/tex] and it is an attractive force as the two balloons have opposite charges (+ and - charges).

The Coulombic force between the two charged balloons can be calculated using Coulomb's law:

[tex]F = k * (q1 * q2) / r^2[/tex]

where F is the force, k is the Coulomb constant [tex](9 * 10^9 N*m^2/C^2)[/tex], q1 and q2 are the charges of the two balloons, and r is the distance between them.

Substituting the given values, we get:

F =[tex]9 * 10^9 * [(+6.25 * 10^{-9}) * (-3.5 * 10^{-9})] / (0.255)^2[/tex]

F = [tex]-3.17 *10^{-4} N[/tex] (negative sign indicates an attractive force)

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Stored elastic potential energy can be utilized in everyday objects such as springs and rubber bands, allowing for the transfer of energy through the conversion of potential energy into kinetic energy.

One common example of stored elastic potential energy being utilized is a compressed spring. When a spring is compressed, work is done on it to store potential energy, which can then be released to do work on other objects. For instance, a spring-loaded toy car will store potential energy in its compressed spring, which is then released when the car is let go, causing it to move forward. This energy transfer is from the spring to the car's kinetic energy.

Another example of stored elastic potential energy is a stretched rubber band. When a rubber band is stretched, energy is stored in its molecular bonds, which can be released when the band is allowed to snap back into its original shape. This potential energy can be utilized in everyday life, for example, in a slingshot. When the rubber band is stretched back in a slingshot, it stores potential energy, which is then released when the projectile is released, converting potential energy into kinetic energy. This energy transfer is from the rubber band to the projectile's kinetic energy.

In both cases, the transfer of energy occurs through the conversion of potential energy into kinetic energy, allowing for work to be done on another object. These examples show how the principle of stored elastic potential energy can be utilized in everyday objects, making them more efficient and useful.

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The stress on a wire that supports a load depends on the weight of the load and the cross-sectional area of the wire.

The stress is defined as the amount of force per unit area, so a larger load or a smaller wire cross-sectional area will result in a higher stress on the wire.

In addition to these factors, the material properties of the wire are also important in determining the stress. Different materials have different strengths and may behave differently under stress.

For example, a wire made of a brittle material may fail suddenly under stress, while a wire made of a ductile material may bend or deform before breaking.

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Thank you for offering your lab report to others! However, it's important to remember that sharing your work can lead to academic misconduct if others use your report as their own.

It's important for everyone to complete their assignments independently and to not share their work with others.

It's also important to understand the concepts behind Newton's Laws of Motion rather than relying solely on someone else's report.

That being said, if anyone is struggling with the lab, it's best to seek help from the instructor or a tutor. Good luck with your assignment!

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On its highest power setting, a certain microwave oven projects 1.00kW of microwaves onto a 30.0 by 40.0 cm area. Intensity is 8.33 × 10^3 W/m^2, Peak electric field strength is 4.84 × 10^4 V/m, Peak magnetic field strength is 1.61 × 10^-4 T

(A) To find the intensity (I) in W/m^2, we use the formula I = P/A, where P is power and A is area.

Power (P) = 1.00 kW = 1000 W
Area (A) = 30.0 cm × 40.0 cm = 0.3 m × 0.4 m = 0.12 m^2
I = P/A = 1000 W / 0.12 m^2 = 8.33 × 10^3 W/m²

(B) The average intensity (I_average) is related to the peak electric field strength (E0) by the formula:
I_average = (1/2) × ε0 × c × E0^2
where ε0 is the vacuum permittivity (8.85 × 10^-12 C^2/N·m^2), c is the speed of light (3 × 10^8 m/s), and E0 is the peak electric field strength.
To find the peak electric field strength, first, we'll rearrange the formula to isolate E0:
E0^2 = (2 × I_average) / (ε0 × c)
E0 = sqrt((2 × I_average) / (ε0 × c))
Now, let's plug in the values:
E0 = sqrt((2 × 8.33 × 10^3 W/m^2) / (8.85 × 10^-12 C^2/N·m^2 × 3 × 10^8 m/s))
E0 ≈ 4.84 × 10^4 V/m

(C) To find the peak magnetic field strength (B0), we use the formula:

B0 = E0 / c
B0 = (4.84 × 10^4 V/m) / (3 × 10^8 m/s)
B0 ≈ 1.61 × 10^-4 T

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The coefficient of volume expansion of a material is a measure of how much its volume changes with a change in temperature. For aluminium, the coefficient of volume expansion is approximately [tex]7.1 \times 10^{-5}[/tex] per degree Celsius ([tex]K^{-1}[/tex]).

For aluminium, the coefficient of volume expansion is approximately [tex]23.1 \times 10^{-6}[/tex] per degree Celsius. This means that for every degree Celsius increase in temperature, the volume of aluminium will increase by approximately 23.1 parts per million (ppm).

This coefficient of volume expansion is an important property of aluminium, as it affects its behaviour in a variety of applications. For example, in the aerospace industry, aluminium is used extensively in the construction of aircraft because of its low weight and high strength-to-weight ratio. However, as the temperature of the aircraft changes during flight, the volume of the aluminium components will also change, potentially affecting the structural integrity of the aircraft.

Understanding the coefficient of volume expansion is therefore essential for engineers and designers working with aluminium in a variety of fields, from aerospace to construction to electronics.

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The mass of the disk is 1.90 kg.We can start by using the formula for torque, which relates torque to angular acceleration and moment of inertia:

τ = Iα

where τ is the torque, I is the moment of inertia, and α is the angular acceleration.

Since the disk is rotating about a perpendicular axis through its center, its moment of inertia can be calculated as:

I_disk = (1/2)MR^2

where M is the mass of the disk and R is its radius.

Similarly, the moment of inertia of the ring can be calculated as:

I_ring = MR^2

where M is the mass of the ring and R is its radius (which is the same as the radius of the disk).

Since the disk and ring have the same mass, we can add their moments of inertia to get the total moment of inertia:

I_total = I_disk + I_ring = (1/2)MR^2 + MR^2 = (3/2)MR^2

Now we can use the given values of torque and angular acceleration to solve for the mass of the disk:

τ = (1/2)MR^2α

0.227 N-m = (1/2)M(0.455 m)^2(0.109 rad/s^2)

Solving for M, we get:

M = 0.227 N-m / [(1/2)(0.455 m)^2(0.109 rad/s^2)] = 1.90 kg

Therefore, the mass of the disk is 1.90 kg.

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The level of ecological organization referenced in the statement "The herd of elephants moved quickly" is the population level.

This is because a population consists of individuals of the same species, in this case, elephants, living in the same area and interacting with one another.

In this particular statement, the focus is on a group of elephants, referred to as a herd. A herd is a group of individuals of the same species, in this case, elephants, that live and interact together. The movement of the herd as a collective entity implies the behavior and characteristics of the population as a whole.

At the population level of ecological organization, the emphasis is on understanding the dynamics, behaviors, and interactions of a group of individuals belonging to the same species in a particular area.

The population level provides insights into factors such as population size, population density, population growth, social dynamics, and reproductive patterns.

In the given statement, the mention of the herd of elephants moving quickly suggests a collective behavior and movement pattern observed in a population of elephants.

This observation would be relevant to understanding the ecological dynamics and behavioral characteristics specific to elephant populations, such as their migratory patterns, foraging strategies, or response to environmental changes.

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If x = 3.0 cm and y = 15.0 cm, The ideal mechanical advantage (ima) of the pliers is: 5.

The IMA of pliers can be determined by using the formula:

IMA = Length of Effort Arm (y) / Length of Resistance Arm (x)

In this case, y is the length of the effort arm (15.0 cm), and x is the length of the resistance arm (3.0 cm). Plugging these values into the formula, we get:

IMA = 15.0 cm / 3.0 cm

IMA = 5

So, the ideal mechanical advantage of the pliers is 5. This means that, ideally, the force applied by the pliers is magnified by a factor of 5.

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To fathom this issue, we have to be utilize Newton's moment law of movement, which states that the net force acting on an question is equal to the item of its mass and increasing speed. Able to utilize this law to discover the speeding up of the object:

Net force= ma

where m is the mass of the object and a is its increasing speed.

In this case, the net force is the horizontal force of 18N short the frictional constrain of 7N:

Net constrain = 18N - 7N = 11N

The mass of the object is given as 30N, so we are able modify the condition to unravel for the speeding up:

a = Net force / m = 11N / 30N = 0.37 m/s^2

Hence, the object is accelerating at a rate of 0.37 m/s^2 along the table.

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The temperature of the water is the independent variable because it is being deliberately changed by the experimenter to see how it affects the rate of mineral dissolution. Option B.

The independent variable is the variable that the researcher intentionally changes or manipulates in an experiment in order to observe its effect on the dependent variable.

In this case, the independent variable is the temperature of the water because it is what Jose is changing in each trial to see how it affects the rate at which the minerals dissolve.

The dependent variable, on the other hand, is the rate at which the minerals dissolve, because it is what is being measured and expected to change based on the independent variable.

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The observation from the constructive interference supports the model of the wave nature of light. The correct option (A).

The observation of diffraction and interference lends weight to the idea that light behaves like a wave. When two or more waves interact with one another, interference occurs. It can be constructive (where the waves reinforce one another) or destructive (where the waves cancel one another out). When light waves from various sources overlap or pass through small gaps, this phenomenon can be seen.

Another property of waves, including light waves, is diffraction. When waves approach an obstruction or pass through an opening, they may bend or spread out. When light waves come into contact with sharp edges, slits, or other obstructions, diffraction patterns can be seen, and they are compatible with how waves behave.

Strong proof that light is a wave and that theories like the electromagnetic wave theory of light are correct can be found in the observations of interference and diffraction.

Hence, The observation from the constructive interference supports the model of the wave nature of light. The option is (A).

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Complete Question:

Which observation supports a model of the nature of light in which light acts as a wave?

A. Constructive interference

B. Temperature change

C. Blackbody radiation

D. Photoelectric effect​

The frequency of the 5th harmonic of a 5 Hz fundamental is 25 Hz.

To find the frequency of the 5th harmonic (h₅) of a 5 Hz fundamental, you need to multiply the fundamental frequency (f₁) by the harmonic number (n). The formula is:

fₙ = n*f₁

where:

fₙ = frequency of the nth harmonic

f₁ = fundamental frequency

n = harmonic number

In this case, the fundamental frequency (f₁) is 5 Hz and the harmonic number (n) is 5. So, the frequency of the 5th harmonic (h₅) would be:

h₅ = 5 * 5

= 25 Hz

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