A photoelectric cell is successively illuminated by two monochromatic radiations of…
PHYSICS · Single correct · A Level · Physics · Particles and radiation · Particles and radiation
Problem
A photoelectric cell is successively illuminated by two monochromatic radiations of equal intensity but different frequencies ν1 and ν2 (ν2>ν1>ν0, where ν0 is the threshold frequency). Which of the following correctly compares the two I–V curves obtained on the same axes?
(a) Both saturation photocurrent and stopping potential are identical for the two curves
(b) Saturation photocurrent is the same, but the curve for ν2 shows a larger (more negative) stopping potential than that for ν1
(c) Saturation photocurrent is larger for ν2, and its stopping potential is larger than that for ν1
(d) Saturation photocurrent is the same, but the curve for ν2 shows a smaller (less negative) stopping potential than that for ν1