Consider a \( 20 \mathrm{~W} \) bulb emitting light of wavelength \( 5000 \AA \) and shining on ....

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Consider a \( 20 \mathrm{~W} \) bulb emitting light of wavelength \( 5000 \AA \) and shining on a metal surface kept at a distance \( 2 \mathrm{~m} \). Assume that the metal surface has work function of \( 2 \mathrm{eV} \) and that each atom on the metal surface can be treated as a circular disk of radius \( 1.5 \AA \)

Time required by the atom disk to receive energy equal to work function \( (2 \mathrm{eV}) \)
(1) \( 35 \mathrm{~s} \)
(2) \( 15 \mathrm{~s} \)
(3) \( 2=11 \mathrm{~s} \)
(4) \( 10 \mathrm{~s} \)


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