Question: Q. 5. Monochromatic light of frequency 6.0×1014 Hz is produced by a laser. The power emitted is 2.0× 103 W. Calculate the (i) energy of a photon in the light beam and (ii) number of photons emitted on an average by the source. [CBSE Comptt. 2018]

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Solution:

Ans. Calculating

(i) Energy of a photon

1/2+1/2

(ii) Number of photons emitted

Energy of photon =hv

=6.63×1034×6.0×1014 J

=3.978×1019 J

2.49eV Number of photons emitted per second Power

= Energy of photon 

=2.0×103 J/s3.978×1019 J

=5.03×1015 photons / second

[CBSE Marking Scheme 2018]



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