Monochromatic light of frequency $6.0 imes$ $10^{14} \mathrm{~Hz}$ is produced by a laser. The power emitted is $2 imes 10^{-3} \mathrm{~W}$. The number of photons emitted, on the average, by the source per second is:

Question

Monochromatic light of frequency $6.0 	imes$ $10^{14} \mathrm{~Hz}$ is produced by a laser. The power emitted is $2 	imes 10^{-3} \mathrm{~W}$. The number of photons emitted, on the average, by the source per second is:

Aicharya · Accepted Answer

$\eta=\frac{p}{m v}=\frac{2 	imes 10^{-3}}{6.62 	imes 10^{-34} 	imes 6 	imes 10^{14}}$ $=5 	imes 10^{15}$

Monochromatic light of frequency $6.0 \times$ $10^{14} \mathrm{~Hz}$ is produced by a laser. The power…

Solution