A metal has a work function \( h v_{0} \). If photon of \( 2 \mathrm{~h} v_{0} \) falls on the s...
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0A metal has a work function \( h v_{0} \). If photon of \( 2 \mathrm{~h} v_{0} \) falls on the surface, the electron comes out with a velocity of \( 4 \times 10^{6} \mathrm{~m} / \mathrm{s} \). If photon energy is increased to \( 5 \mathrm{~h} v_{0} \), the maximum velocity of photon electron will be
(A) \( 2 \times 10^{7} \mathrm{~m} / \mathrm{s} \)
(B) \( 4 \times 10^{7} \mathrm{~m} / \mathrm{s} \)
(C) \( 2 \times 10^{6} \mathrm{~m} / \mathrm{s} \)
(D) \( 8 \times 10^{6} \mathrm{~m} / \mathrm{s} \)
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