question_answer

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.                      

Answer:

                  For the curves a and b, the stopping potential is same. Hence for curves a and b, the frequency of incident radiation is same \[({{v}_{1}}={{v}_{2}})\]but intensities \[{{I}_{1}}\] and \[{{I}_{2}}\] are different.