(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 $I_2)$ have the same frequency v and the third has frequency $v_1 > v$ (c) Explain the nature of the curves on the basis of Einstein's equation .

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