Monochromatic light of frequency 6 × 10 14 Hz is produced by a laser. The power emitted is 2 × 10 - 3 W .…

Monochromatic light of frequency 6×1014 Hz is produced by a laser. The power emitted is 2×10-3 W. How many photons per second on an average, are emitted by the source?

(Given h=6.63×10-34 J s)

  1. 9×1018
  2. 6×1015
  3. 5×1015
  4. 7×1016

Solution

Energy of a single photon is given by, hν. Therefore, power can be written as 

P=nhv

⇒n=Phν=2×10-36.63×10-34×6×1014

=5×1015

Asked in: JEE Main 2024 (01 Feb Shift 2)

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