The electronic circuitry in an ultrasonic receiver measures the transit time and calculates the distance from the receiver to the surface of material.
a. True
b. False

Answer:

The Balmer series is given by

1 / λ = R (1 / 2^2 - 1 / n^2)

where R is the Rydberg constant of 1.0968E-3 / Angstroms

(1 Angstrom = 1.0E-1 nm = 10E-10m)

Let x = (1 / 4 - 1 / n^2)

x = 1 / (R λ)

Note 410 nm = 4100 A

x = 1 / (1.0968E-3 * 4.1E3) = 1 / (1.0968 * 4.1) = .222

If we write

x = 1/4 - 1/n^2 = .222

1/n^2 = 1/4 - .222 = .0276

n^2 = 36.2

So n = 6

(Since modern terminology gives wavelengths in nanometers - it might be helpful to write R = 1.0968E7 m-1)

Answer:

Most alpha particles went right through. This showed that the gold atoms were mostly empty space

Answer:

moon planet star galaxy universe

Answer:

real

Explanation:

Answer:

They have similar temperatures and moisture properties.

If a supernova remnant core has a mass greater than 2.8 solar masses, then NO force will be able to stop gravity from collapsing the core. (Option C)

A supernova Remnant Core is an astronomic structure that is remaining after the explosion of a star in a supernova has occurred.

A supernova is simply the explosion of a star. When the mass of the sun is used as a unit of mass, it is called solar mass. This unit is given as:

1.989 × 1030 kg.

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You almost certainly meant to say the particle's position is a function of time t, not some other variable x (or vice versa) so that

s(t) = 5t sin(2t)

Differentiate s(t) to get the instantaneous velocity of the particle at time t. By the product rule,

s'(t) = 5 sin(2t) + 10t cos(2t)

Evaluate the derivative at t = 0 :

s'(0) = 0

The instantaneous velocity at t = 0 is 0 m/s.

To find the instantaneous velocity at t = 0, we need to take the derivative of the position function s(t) with respect to time (t). The derivative of s(t) gives us the velocity function v(t), which represents the particle's velocity at any given time t.

Given the position function s(t) = 5t * sin(2t), we find the velocity function v(t) by taking the derivative:

v(t) = d/dt (5t * sin(2t)).

To find the velocity at t = 0, we substitute t = 0 into the velocity function:

v(0) = 5 * 0 * sin(2 * 0) = 0.

Therefore, the instantaneous velocity of the particle at t = 0 is 0 m/s. This means that at t = 0, the particle is momentarily at rest, and its velocity is neither increasing nor decreasing at that specific moment.

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Answer:

Resistance / Edge 2022

Explanation:

This is late, but just in case someone needs the answer. Hope this helps!

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Tungsten metal is used exclusively for making the filament of electric bulbs because it has a very high melting point

Tungsten metal is used exclusively for making the filament of electric bulbs because it has a very high melting point. Due to its high melting point, the tungsten filament can be kept white-hot without melting away

Tungsten wire is used as the filament in light bulbs. It glows white-hot as current passes through it.

Tungsten is used in light bulbs because its high resistivity converts electric energy into light and heat.

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Answer:

Joule (J)

Explanation:

Joule (J) is the SI unit of heat energy (any energy - thermal, electrical, mechanical..).  It is named after the English physicist James Prescott Joule.

Question :-

Answer :-

[tex] \rule {180pt}{2pt} [/tex]

Given :-

To Find :-

Solution :-

As per the provided information in the given question, we have been given that the Resistance of the Device is 20 Ohm's. It's Current is given as 15 Ampere . And, we have been asked to calculate the Voltage .

For calculating the Voltage , we will use the Formula :-

[tex] \bigstar \: \: \: \boxed {\sf { \: Voltage \: = \: Current \: \times \: Resistance \: }} [/tex]

Therefore , by Substituting the given values in the above Formula :-

[tex] \Longrightarrow \: \: \: \sf { Voltage \: = \: Current \: \times \: Resistance } [/tex]

[tex] \Longrightarrow \: \: \: \sf { Voltage \: = \: 15 \: \times \: 20 } [/tex]

[tex] \Longrightarrow \: \: \: \bf { Voltage \: = \: 300 } [/tex]

Hence :-

[tex] \underline {\rule {180pt}{4pt}} [/tex]

Additional Information :-

[tex] \Longrightarrow \: \: \: \sf {Voltage \: = \: Current \: \times \: Resistance} [/tex]

[tex] \Longrightarrow \: \: \: \sf {Current \: = \: \dfrac {Voltage}{Resistance}} [/tex]

[tex] \Longrightarrow \: \: \: \sf {Resistance \: = \: \dfrac {Voltage}{Current} } [/tex]

Answer:

300 volts

Explanation:

now in this question we have been given our resistance which is 20 ohms and our current which is 15A

using ohm's law

V=IR

where v is voltage, I is current and r is resistance

now substitute,

V=15 x 20

V=300

I hope I helped

Explanation:

V=C/n

Quartz: (3×10^8)/(1.54)=1.948×10^8 m/s

The higher the index of refraction the slower light will travel, so light will be slower in ruby.

The function of the load in an electric circuit is it safely opens and closes the circuit. Thus, the correct option is D.

An electrical load is an electrical component or a portion of the electric circuit which consumes electric power, such as electrical appliances and lights inside the house. The electric loads may also refer to the power consumed by a circuit. This is opposite to a power source, such as a battery or a generator, which produces electric power.

The base load power plants typically are the coal-fueled or nuclear plants due to their low-cost fuel and steady state power they can produce in a plant. The hydropower and geothermal power plants can also be used for the purpose of base load electricity generation if those resources are regionally available.

Therefore, the correct option is D.

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The forces exerted on a charge will be 3.75 N.The force acted on the charge due to the electric field.

The electric force between the two charges is directly propotional to the product of the charge and inversly propotional to the square of the distance between them.

The given data in the problem is;

F is the force exerted

q is the charge = 2.5 µc

[tex]\rm \alpha[/tex] is the angle = 90°

B is the magnetic field = 3.0 × 10² T

v is the velocity = 5.0 × 103 m/s

Force on the moving charge is found as;

[tex]\rm F = q V B sin \alpha \\\\ F = 2.5 \times 10^{-6} \times 3 \times 10^{-2} \times 5 \times 10^3 \\\\ F=3.75 \ N[/tex]

Hence the force exerted on a charge will be 3.75 N

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Answer:

Time,

t

=

3.1

s

Temperature,

T

=

23.0

∘

Speed of the sound at

23.0

∘

can be given as,

{eq...

Answer:

The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged)

Explanation:

Answer:

The angular speed of the system increases because the moment of inertia of the system has decreased.  

Explanation:

The Sun is a main-sequence star which is also known as G2V.

It can also known as yellow dwarf because of its yellow colour. It was formed about 4.6 billion years ago from the gravitational collapse of matter of a large molecular cloud.

So we can conclude that the Sun is a main-sequence star which is also known as G2V.

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The kinetic energy of the two-block system before the collision will be [tex]\frac{9}{2} MV_S^2[/tex]. Momentum get conserved during the collision.

The abrupt, violent coming together in direct contact of two bodies is known as the collision.a falling object and a floor are examples of collision.

According to the law of conservation of momentum, the momentum of the body before the collision is always equal to the momentum of the body after the collision.

According to the law of conservation of momentum;

Momentum before collision =Momentum after collision

[tex]\rm MV+2m(0)=(3M)V_S\\\\ V= \frac{3MV_S}{M} \\\\ V= 3V_S[/tex]

Velocity of the block before collision is [tex]\rm 3V_S[/tex].

The kinetic energy of the two-block system before the collision is found as;

[tex]\rm KE = \frac{1}{2} mv^2 \\\\\ \rm KE = \frac{1}{2} m(3V_S)^2 \\\\\ \rm KE = \frac{9}{2} MV_S^2[/tex]

Hence, the kinetic energy of the two-block system before the collision will be [tex]\frac{9}{2} MV_S^2[/tex].

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A collision is any situation in which two or more bodies quickly exert forces on one another.

Thus, The momentum of the body prior to the contact is always equal to the momentum of the body following the impact, according to the law of conservation of momentum.

The difference between the system's total kinetic energy before and after a collision can be used to categorize collisions in physics:

The collision is said to as being inelastic if the majority or all of the total kinetic energy is lost (dissipated as heat, sound, etc. or absorbed by the objects themselves); such collisions involve the objects coming to a complete stop.

Thus, A collision is any situation in which two or more bodies quickly exert forces on one another.

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(i) See the attachment.

(ii) (a) 2.4 Ω, (b) 2.5 A, (c) 1.0 A

Explanation:

(ii) (a) If the resistance of the parallel combination is Rρ, then

[tex] \frac{1}{Rρ} = \frac{1}{4} + \frac{1}{6 } \\ = > \frac{3 + 2}{12} = \frac{5}{12 } \\ or \\ Rρ = \frac{12}{5} Ω = 2.4Ω[/tex]

(b) Let the current through the battery be I, then,

[tex]I = \frac{V}{Rρ} = \frac{6}{2.4} \\ I = 2.5 \: Α[/tex]

(c) The potential difference across each resister is V = 6 volt (same as of the battery) since they are in parallel.

Current through 4 Ω resister :-

[tex]I₁ = \frac{V}{R₁} = \frac{6}{4} \\ I₁ = 1.5 \: Α[/tex]

Current through 6 Ω resistor :-

[tex]I₂ = \frac{V}{R₂} = \frac{6}{6} \\ I₂ = 1.0 \: Α \\ \\ Note \: that \: I \: = I₁ \: + I₂.[/tex]

Explanation:

The speed of light in air is approximately 300,000,000 meters per second. The speed of sound in air is approximately 343 meters per second. Light is the propagation of electromagnetic waves, while sound is the physical vibration of the medium

Answer:

13 and 9

Explanation:

Coefficients are numbers that are being multiplied by a variable. In this case, 13 and 9 are being multiplied by x and y, so they are the coefficients. 77 and 11 are constants.

White color is the result of adding various combinations of red, green, and blue primary light colors in equal intensities.

The three primary colors are Red, green, and blue. This implies that by additively combining the colors red, green, and blue in varied proportions the different color is obtained.

Practically all other colors may be made, and when the three primaries are mixed together in equal amounts, white is produced.

Hence white color is the result of adding various combinations of red, green, and blue primary light colors in equal intensities.

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Answer:

The total energy of the system remains constant due to the law of conservation of energy.

The diagram is the one that starts with "wind energy" and breaks up into "heat energy in the turbines and air" and "kinetic energy in moving the turbine"

Explanation:

I just took the test and this was the correct answer.

Answer:

all subjective study or experiment if the correct answer of given statement

Answer:

science is a practical yet knowledge based subject based of the way of subtle nature and way everything works . neither theory nor law . science is a thing that constitutes both in a way further understandable and easy . hope it solved you query

The similarities between the two models of the solar system are :

The solar system can be represented using two different models ( the Earth centered model and the sun centered model ) in both model the sun or the earth is kept as a central planet while other planets including the moon and stars revolve round the central planet.

Hence we can conclude that the similaritied between the models are as listed above.

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Answer:

A wave carries energy

Explanation:

The phenomena that support only the wave theory of light are Diffraction and Interference.

Light or visible light is electromagnetic radiation within the portion of the electromagnetic spectrum that is perceived by the human eye.

The light sometimes acts like a particle and sometimes like a wave, yet the diffraction and interference are proof of the light's wave nature.

First of all, as a definition, interference is an effect caused by the superposition of two systems of waves (from two different sources). (As an example, the interference -distortion- in radio waves)

Diffraction, by the other hand, refers to several events that occur when a wave meets an obstacle. (usually described as bending of waves around obstacles like the water waves- and in other cases as the dissemination of waves, once they passed small openings)

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Answer:

interference, diffraction, scattering, dispersion, polarisation etc.Explanation: edge

Answer:

C

Explanation:

I got it right on edge 2022

Answer:

c

Explanation:

because im hot

Answer:

A wire carrying a 30.0-A current passes between the poles of a strong magnet that is perpendicular to its field and experiences a 2.16-N force on the 4.00 cm of wire in the field. What is the average field strength?

Explanation:

hope this helps trying to be brainliest

A star will become a white dwarf when its nuclear fuel is finished because of no more emission of heat and light.

When the end of the nuclear burning stage of a star comes, such a star expels most of its outer material creating a planetary nebula until only the hot core remains. When this core settles down, it will become a young white dwarf.

So we can conclude that a star will become a white dwarf when its nuclear fuel is finished because of no more emission of heat and light.

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