Q1.
The figures in the options show the photocurrent $J$ of a photoelectric material versus the frequency $f$ of an incident light beam. The light beam can have three different intensities $I_1, I_2, I_3$, with $I_3 \gt I_2 \gt I_1$. Which of the options is correct?
(A)
(B)
(C)
(D)
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