Monochromatic light of frequency 6 × 10 14 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 -

Question

Monochromatic light of frequency 6 × 10 14 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 )

TestHub · Accepted Answer

Energy of a single photon is given by, h ν . Therefore, power can be written as P = n h v ⇒ n = P h ν = 2 × 10 - 3 6 . 63 × 10 - 34 × 6 × 10 14 = 5 × 10 15

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