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Answer:
iv)Salt
III) Ethanol
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Related Questions
You are making photoelectric measurements on an electrode of an unknown metal. With zero potential difference applied by the battery, you shine various freqencies of light on the cathode. You detect a small photocurrent for light with wavelength up to 451 nm. What metal is the electrode made of
Answers
Since you detect a small photocurrent for light with wavelength up to 451 nm, the metal the electrode is made of is Sodium.
To solve the question, we need to know what work function is.
What is work function of a metal?This is the minimum energy at which an electron will be emitted from the surface of a metal.
Since a small photocurrent is detected when ligh of wavelength up to 451 nm is applied with a zero potential difference applied, this is the threshold wavelength which gives the work function of the metal.
So, work function Ф = hc/λ where
h = Planck's constant = 6.63 × 10⁻³⁴ Js, c = speed of light = 3 × 10⁸ m/s and λ = wavelength of light = 451 nm = 451 × 10⁻⁹ mSubstituting the values of the variables into the equation, we have
Ф = hc/λ
Ф = 6.63 × 10⁻³⁴ Js × 3 × 10⁸ m/s ÷ 451 × 10⁻⁹ m
Ф = 19.89 × 10⁻³⁴ × 10⁸ Jm ÷ 451 × 10⁻⁹ m
Ф = 0.0441 × 10⁻¹⁷ J
Ф = 4.41 × 10⁻¹⁹ J
Since 1 eV = 1.602 10⁻¹⁹ J,
Ф = 4.41 × 10⁻¹⁹ J × 1 eV/1.602 10⁻¹⁹ J
Ф = 2.753 eV
From tables, the metal with the work function closet to this value is Sodium.
So, the metal the electrode is made of is Sodium.
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What statement best describes the situation in the diagram
Answers
The forces are balanced and the book is at rest.
Explanation:
When the forces (amount of Newtons) on an object are equal and in opposite directions, the forces are balanced, and there is no change in motion.
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What is the difference between synchronous and asynchronous?.
Answers
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Answer:synchronous communications are scheduled, real-time interactions by phone, video, or in-person. Asynchronous communication happens on your own time and doesn't need scheduling.
Explanation:
Unpolarized light of intensity Io is incident on a stack of 7 polarizing filters, each with its axis rotated 17°cw with respect to the previous filter. Find the ratio between light intensity emerges from the last filter and unpolarized light of intensity Io. It/Io= _________
Answers
The ratio of the intensity between light intensity that emerges from the last filter and unpolarized light of intensity, I₀ is It/I₀ = 0.2925
To answer the question, we need to know what polarization of light is.
What is polarization of light?This is when the electric field vector of light is oscillating in one plane.
Now for light of intensity I' which is initially unpolarized, its intensity after polarization is I = 1/2I'.Also, for light initially polarized, its intensity after polarization is I"' = I"cos²Ф where Ф is the angle between the initial direction and the direction of polarization.Intensity of light through each polarized filterGiven that we have 7 polarizing filters, each rotated 17° cw with respect to the previous filter.
So, since the light is initially unpolarized,
The intensity through the first polarizing filter is I₁ = 1/2I₀ where I₀ is the initial intensity.The intensity through the second polarizing filter is I₂ = I₁cos²17°= 1/2I₀cos²17°The intensity through the third polarizing filter is I₃ = I₂cos²17° = 1/2I₀cos⁴17°The intensity through the fourth polarizing filter is I₄ = I₃cos²17° = 1/2I₀cos⁶17°The intensity through the fifth polarizing filter is I₅ = I₄cos²17° = 1/2I₀cos⁸17°The intensity through the sixth polarizing filter is I₆ = I₅cos²17° = 1/2I₀cos¹⁰17°The intensity through the seventh polarizing filter is I₇ = I₆cos²17° = 1/2I₀cos¹²17°.The ratio of the intensity between light intensity that emerges from the last filter and unpolarized light of intensitySince I₇ is the last intensity I₇ = It = 1/2I₀cos¹²17°.
So, It/I₀ = 1/2cos¹²17°
= 1/2(0.9563)¹²
= 1/2 × 0.5850
= 0.2925
So, the ratio of the intensity between light intensity that emerges from the last filter and unpolarized light of intensity, I₀ is It/I₀ = 0.2925
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If the net force on an object is in a negative direction, what will the direction of the resulting acceleration be?
Answers
The phase of the moon that immediately precedes the new moon is the:.
Answers
A bobsled’s distance-time graph indicates that it traveled 100 m in 20 s.
What is the bobsled’s speed?
100 m/s
0.25 m/s
2500 m/s
5 m/s
Answers
Answer:
5m/s -> 100m/20s=5m/s
Explanation:
because speed equal to distance division time
A sample of 0. 200 moles of nitrogen occupies 0. 400 l. Under the same conditions, what number of moles occupies 1. 200 l?.
Answers
Answer:0. 600
Explanation: basic math
What do we call the bright, sphere-shaped region of stars that occupies the central few thousand light-years of the milky way galaxy?.
Answers
Answer: The galaxy's bulge
Explanation:
A 50.0g sample of C-14 has decayed leaving only 3.1g. How much time has elapsed since the original sample was weighed? The half life of C-14 is 5730 years
Answers
Answer: 17,000
Explanation: I got it right
PLEASE ANSWER QUICKLY
Answers
Answer:
the third one
Explanation:because coal cause more pollition
Four forces are acting on a block as shown in the figure. What is the net force on the block?
Answers
Answer:
8 N upwards
Explanation:
Hello people ~
Choose the vector physical quantity:
(a) Electric flux
(b) Electric potential
(c) Electric potential energy
(d) Electric intensity
Answers
Answer:
Electric field intensity (Option D)
Explanation:
Vector quantities have both magnitude and direction whereas scaler quantities have only magnitude
Electric field intensity is denoted by E
The formula is
[tex]\\ \rm\Rrightarrow E=\dfrac{F}{q}[/tex]
Q is charge hereAnswer:
(d) Electric intensity
Explanation:
A vector physical quantity has both magnitude and directionIntensity is the strength of an electric field at any point and it is equal to the electric force per unit charge experienced by a test charge placed at that point.⇒ Intensity = Electric Force / ChargeAs electric force is a vector quantity, electric intensity is the vector quantityTo heat the water in the tank from 50°C to 58°C the immersion heater transfers
4032 kJ of energy to the water.
Calculate the mass of water in the tank.
Specific heat capacity of water= 4200 J/kg°C
Answers
Let's see
∆T=58-50=8°CSo
[tex]\\ \rm\Rrightarrow Q=mc\Delta T[/tex]
[tex]\\ \rm\Rrightarrow 4032=4200(8)m[/tex]
[tex]\\ \rm\Rrightarrow 4032/8=4200m[/tex]
[tex]\\ \rm\Rrightarrow 504=4200m[/tex]
[tex]\\ \rm\Rrightarrow m=0.12kg[/tex]
[tex]\\ \rm\Rrightarrow m=120g[/tex]
Examine the distance-time graph.
Which line represents travel at the fastest speed? Justify your answer.
Answers
Answer:
A
Explanation:
because it is accelerating and as the vehicle accelerates the speed increas
Please help me with the blanks
Answers
Also:
... particles, including alpha particles and neutrinos.
What is a benfit of useing a restince band in workouts?
Answers
Answer:
It makes it more difficult to move, making it stretch and exercise your muscles better becuse there is a resistant force to overcome.
Explanation:
-Sky :3
Answer:
It keeps sweat out of your eyes, because it absorbs it.
Explanation:
Sweat is still liquid, and plus if you pay extra and can even have some sort of cooling gel.
Sky is also correct.
if the distance moved by the effort is greater than the distance moved by the load, the machine is speed multiplier. TRUE/FALSE
Answers
Answer: TRUE
Explanation: I did it before
Which are thought to have formed farthest from the sun?.
Answers
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A 50 kg person receives an absorbed dose of gamma radiation of 20 millirads. What is the total energy absorbed?.
Answers
For a 50 kg person receives an absorbed dose of gamma radiation of 20 millirads, the total energy absorbed is mathematically given as
E=0.1457J
What is the total energy absorbed?Generally, the equation for the total energy absorbed is mathematically given as
E=mass*gamma radiation
Therefore
E=50*20*19^{-3}
E=0.1457J
In conclusion, the total energy absorbed
E=0.1457J
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An electromagnet would
have the greatest strength
if its wire were wrapped
around a core made of:
A paper
B copper
C aluminum
D iron
Answers
An electromagnet would have the greatest strength if its wire were wrapped around a core made of copper.
Electromagnetic strengthThis is the strength of an electromagnet which increases with increase in the number of turns of the coil, thickness of the coil and magnetic field strength.
emf = NBA/t
The strength of an electromagnet also increases with increase in current and voltage flowing in the loop.
Copper is better conductor of electricity when compared to aluminum and iron.
Thus, an electromagnet would have the greatest strength if its wire were wrapped around a core made of copper.
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How would the size of
parachute required on a space
probe to allow it to land safely
differ on:
a planet such as Venus
which has a thick
atmosphere.
Answers
Answer:
Explanation:
The atmosphere is too thin to slow the descent for a soft landing. Mars is almost a vacuum, it is the equivalent to Earth atmosphere around 125,000 feet. ... You do not want your lander to get entangled with the chute on landing, so you loose the chute right before you land.
is the statement down below true or false?
A planet's path is an ellipse centered on the sun, according to Kepler's first law
Answers
The center of the orbital ellipse is always at one point of the suns center ( meaning the suns center is always found or located at one of the focuses of the orbital ellipse )
What effect does the moon have on the Earth, if any?
Answers
Answer:
If we didnt have the moon we wouldnt have tides, and waves so there for if we had no moon we would have no waves tides solar eclip or night.
Explanation:
Yea Thats all I can list right now.
The primary difference between the various optical discs is the amount of data that they can store. Which optical disc stores the least amount of data
Answers
Floppy disk storage media is a type of magnetic media which only has a capacity of storing about 1.44 MB data.
Which optical disc stores the least amount of data?Blu-ray discs is the type of disc that can store up to 50 GB of data while on the other hand, floppy disk storage media stores only 1.44 MB data.
So we can conclude that Floppy disk storage media is a type of magnetic media which only has a capacity of storing about 1.44 MB data.
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What is the relationship between frequency and wavelength?
Answers
Answer:
Frequency and wavelength are inversely proportional to each other. The wave with the greatest frequency has the shortest wavelength. Twice the frequency means one-half the wavelength.
Explanation:
What were two reasons that the Krystal Beslanowitch case was finally closed?
Answers
Answer:
1. Police Weren't Able To Find Any Real Leads
2. They Didn't Find Any Clues To The Killer Until 18 Years Later
Explanation:
It was unknown at the time, but it would go on to take 18 years for her killer to be arrested and tried for her death. The initial case went on from 1995 to 1997 but ended up closing when the police department was unable to find any real leads.
An object is sliding down an inclined plane at constant velocity. If the coefficient of kinetic friction between the object and the plane is , what is the angle of the plane?
Answers
The angle of the plane will be 26.57°.Angle of plane is the angle of elevaton at which the body exciute motion on the inclined plane.
What is kinetic friction?A force that acts among sliding parts is referred to as kinetic friction. A body moving on the surface is subjected to a force that opposes its progressive motion.
Force on an object due to the gravitational force will be;
[tex]\rm F = mg[/tex]
For the inclined plane the balance forces will be ;
[tex]\rm mgsin \theta = \mum g cos \theta \\\\ \rm\mu = tan \theta \\\\ \theta = tan^{-1}\mu \\\\ \theta = tan^{-1}0.5 \\\\ \theta = 26.57^0[/tex]
Hence the angle of the plane will be 26.57°.
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Which sound wave has higher pitch
Can you also compare the loudness of both
Answers
Answer:
Below one has higher pitchLoudness is roughly the sameExplanation:
Pitch depends on frequencyThe below one has a higher frequency, hence it has a higher pitchThe loudness depends on the amplitudeThe amplitude here in the two is roughly the same as the height of the waves are similarA system is heated with 134 J of energy and, at the same time, the system expands, doing 89 J of work. What is the change in internal energy of the system, in Joules
Answers
The change in internal energy of the system after the heat is added and the system expands doing work to the surrounding is 45 J.
Change in internal energy of the system
The change in internal energy of the system is determined by applying the first law of thermodynamics as shown below;
ΔU = q - w
where;
ΔU is the change in the internal energyq is heat added to the systemw is work done to the surroundingsΔU = 134 J - 89 J
ΔU = 45 J
Thus, the change in internal energy of the system after the heat is added and the system expands doing work to the surrounding is 45 J.
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