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(A) According to Einstein's photoelectric equation,the stopping potential $V_0$ is related to the frequency $f$ of the incident radiation by the equat

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$f_a > f_b > f_c > f_d$

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(A) According to Einstein's photoelectric equation,the stopping potential $V_0$ is related to the frequency $f$ of the incident radiation by the equation: $eV_0 = hf - \Phi$,where $e$ is the charge of an electron,$h$ is Planck's constant,and $\Phi$ is the work function of the metal.From the graph,the stopping potentials are $|V_0^1| Since the stopping potential $V_0$ is directly proportional to the frequency $f$ for a given metal,a larger magnitude of stopping potential corresponds to a higher frequency of incident radiation.Therefore,the order of frequencies is $f_a > f_b > f_c > f_d$.

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.

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