# Monochromatic Light of Frequency 5.0 × 1014 Hz is Produced by a Laser. the Power Emitted is 3.0 × 10–3 W. Estimate the Number of Photons Emitted per Second on an Average by the Source ? - Physics

Monochromatic light of frequency 5.0 × 1014 Hz is produced by a laser. The power emitted is 3.0 × 10–3 W. Estimate the number of photons emitted per second on an average by the source ?

#### Solution

Energy = hν
On an average, number of photons emitted per second  =$\frac{\text { Power}}{\text { energy of one photon}}$

On putting the values:
On an average, number of photons emitted per second

$= \frac{3 \times {10}^{- 3}}{6 . 63 \times {10}^{- 34} \times 5 \times {10}^{14}}$

$= 9 . 05 \times {10}^{15}$

Concept: Refraction of Monochromatic Light
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