Modern Physics 2 Question 18
17. The figure shows the variation of photocurrent with anode potential for a photosensitive surface for three different radiations. Let $I _a, I _b$ and $I _c$ be the intensities and $f _a, f _b$ and $f _c$ be the frequencies for the curves $a, b$ and $c$ respectively
$(2004,2 M)$
(a) $f _a=f _b$ and $I _a \neq I _b$
(c) $f _a=f _b$ and $I _a=I _b$
(b) $f _a=f _c$ and $I _a=I _c$
(d) $f _b=f _c$ and $I _b=I _c$
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Solution:
- Saturation current is proportional to intensity while stopping potential increases with increase in frequency.
Hence, $\quad f _a=f _b$ while $I _a<I _b$
