#### Question

Monochromatic light of frequency 5.0 × 10^{14} 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

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

\[ = 9 . 05 \times {10}^{15}\]

Is there an error in this question or solution?

Solution 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 ? Concept: Refraction of Monochromatic Light.