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Standard XII
Physics
Experimental Study of Photoelectric Effect
Question

(a) Define the term 'intensity of radiation' in photon picture.
(b) Plot a graph showing the variation of photo current vs collector potential for three different intensities $$I_1>I_2>I_3,$$ two of which $$(I_1 and I_3)$$ have the same frequency v and the third has frequency v1>v.
(c) Explain the nature of the curves on the basis of Einstein's equation.

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Solution
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(a) The amount of light energy or photon energy incident per metre square per second is called intensity of radiation.
(c) As per Einstein's equation,
(i) The stopping potential is same for $$I_1$$ and $$I_2$$ as they have the same frequency.
(ii) The saturation currents are as shown in figure because $$I_1>I_2>I_3.$$

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Similar Questions
Q1
(a) Define the term 'intensity of radiation' in photon picture.
(b) Plot a graph showing the variation of photo current vs collector potential for three different intensities $$I_1>I_2>I_3,$$ two of which $$(I_1 and I_3)$$ have the same frequency v and the third has frequency v1>v.
(c) Explain the nature of the curves on the basis of Einstein's equation.
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Q2
The figure shows a plot of three curves a,b,c showing the variation of photocurrent vs collector plate potential for three different intensities $$I_1,I_2,$$ and $$I_3$$ having frequencies $$v_1,v_2$$ and $$v_3$$ respectively incident on a photosensitive surface.
Point out the two curves for which the incident radiations have same frequency but different intensities.

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Q3
If I1,I2 and I3 are the intensities of three radiations incident on the same metal surface with the same frequency such that (I1>I3>I2) and following graph of variation of photo current with respect to anode potential is observed. Find which curve represents the three intensities.


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Q4
Draw a plot showing the variation of photoelectric current with collector plate potential foe two different frequencies, v1>v2, of incident radiation having the same intensity. In which case will the stopping potential be higher ? Justify your answer.
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Q5
The given graph shows the variation of photo-electric current(I) with the applied voltage(V) for two different materials and for two different intensities of the incident radiations. Identify and explain using Einstein's photo electric equation for the pair of curves that correspond to
(i) Different materials but same intensity of incident radiation,
(ii) Different intensities but same materials.

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