Q.

Find out the number of photons emitted by a 60 watt bulb in one minute, if wavelength of an emitted photon is 620 nm :

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a

1.125×1022

b

1.875×1020

c

1.5×1021

d

1.125×1020

answer is A.

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Detailed Solution

E=nhcλ3600=n×6.625×10−34×3×108620×10−9n = 1.125 × 1022.
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Find out the number of photons emitted by a 60 watt bulb in one minute, if wavelength of an emitted photon is 620 nm :