A certain metal when irradiated with light \( (\mathrm{v}=3.2 \times \) \( 10^{16} \mathrm{~Hz} ...

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A certain metal when irradiated with light \( (\mathrm{v}=3.2 \times \) \( 10^{16} \mathrm{~Hz} ) \)  emits photo electrons with twice kinetic energy as did photo electrons when the same metal is irradiated by light \( \left(\mathrm{v}=2.0 \times 10^{16} \mathrm{~Hz}\right) \). Calculate \( \mathrm{v}_{0} \) of electron?
(1) \( 1.2 \times 10^{14} \mathrm{~Hz} \)
(2) \( 8 \times 10^{15} \mathrm{~Hz} \)
(3) \( 1.2 \times 10^{16} \mathrm{~Hz} \)
(4) \( 4 \times 10^{12} \mathrm{~Hz} \)
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