A \( 600 \mathrm{~W} \) mercury lamp emits monochromatic radiation of wavelength \( 331.3 \mathr...

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A \( 600 \mathrm{~W} \) mercury lamp emits monochromatic radiation of wavelength \( 331.3 \mathrm{~nm} \). How many photons are emitted from the lamp per second?
( \( \mathrm{h}=6.626 \times 10^{-34} \mathrm{Js} \), velocity of light \( =3 \times 10^{8} \mathrm{~ms}^{-1} \) )
(a) \( 1 \times 10^{19} \)
(b) \( 1 \times 10^{20} \)
- (c) \( 1 \times 10^{21} \)
(d) \( 1 \times 10^{23} \)
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