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In a photoelectric experiment the relation between applied potential difference between cathode and anode \( V \) and the photoelectric current \( I \) was found to be shown in graph below. If Planck's constant \( h=6.6 \times 10^{-34} \mathrm{Js} \), the frequency of incident radiation would be nearly (in \( \left.\mathrm{s}^{-1}\right)(\phi=1 \mathrm{eV}) \)
(a) \( 0.436 \times 10^{18} \)
(b) \( 0.436 \times 10^{17} \)
(c) \( 0.775 \times 10^{15} \)
(d) \( 0.775 \times 10^{16} \)
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