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Light rays of wave lengths \( 6000 \AA \) and of photon intensity \( 39.6 \mathrm{watt} / \mathrm{m}^{2} \) is incident on a metal
\( \mathrm{P} \)
surface. If only one percent of photons incident on
W
the surface emit photo electrons, then the number of electrons emitted per second per unit area from the surface will be (Planck's constant \( h=6.64 \times 10^{-34} \) ) Js velocity of light \( 3 \times 10^{8} \mathrm{~ms}^{-1} \) )
(1) \( 12 \times 10^{18} \)
(2) \( 10 \times 10^{18} \)
(3) \( 12 \times 10^{17} \)
(4) \( 12 \times 10^{16} \)
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