In a series of photoelectric emission experiments on a certain metal surface, possible relationships between the following quantities were investigated: threshold frequency `f_0`, frequency of incident light f, light intensity P, photocurrent I, maximum kinetic energy of photoelectrons `T_(max)`. Two of these quantities, when plotted as a graph of y against x, give a straight line through the origin. Which of the following correctly identifies x and y with the photoelectric quantities ?

Options

A. x I y `f_0`
B. x f y `f_0`
C. x P y I
D. x P y `T_(max)`

Answer

C

Explanation

The rate of emission of photoelectrons (i.e., photocurrent) depends linearly on the rate of incident photons.