The figure shows the variation of photocurrent with anode potential for four different radiations. Let $f_a,…

The figure shows the variation of photocurrent with anode potential for four different radiations. Let $f_a, f_b, f_c$ and $f_d$ be the frequencies for the curves $a, b, c$ and $d$ respectively
  1. $f_a \gt f_b \gt f_c \gt f_d$
  2. $\mathrm{f}_{\mathrm{a}} \lt \mathrm{f}_{\mathrm{b}} \lt \mathrm{f}_{\mathrm{c}} \lt \mathrm{f}_{\mathrm{d}}$
  3. $\mathrm{f}_{\mathrm{a}}\gt\mathrm{f}_{\mathrm{b}} \lt \mathrm{f}_{\mathrm{c}}=\mathrm{f}_{\mathrm{d}}$
  4. $\mathrm{f}_{\mathrm{a}}=\mathrm{f}_{\mathrm{b}} \gt \mathrm{f}_{\mathrm{c}} \gt \mathrm{f}_{\mathrm{d}}$

Solution

We know stopping potential is directly proportional to the frequency of the incoming radiation. This means curve ' $a$ ' has the highest frequency and ' d ' the lowest. $\therefore \quad f_a \lt f_b \lt f_c \lt f_d$ .

Asked in: MHT CET 2024 (09 May Shift 2)

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