Monochromatic light of frequency 6.0 times 10 | vedclass

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Question

Power of monochromatic light beam is $P=N h\upsilon $ where $N$ is the number of photons emitted per second.

$	ext { Power } P=2 	imes 10^{-3} \m

Vedclass · Accepted Answer

$5  	imes 10^{15}$$\;$

Vedclass · Answer

Power of monochromatic light beam is $P=N h\upsilon $ where $N$ is the number of photons emitted per second.

$	ext { Power } P=2 	imes 10^{-3} \mathrm{W}$

Energy of one photon $E=h\upsilon$

$=6.63 	imes 10^{-34} 	imes 6 	imes 10^{14} \mathrm{J}$

Number of photons emitted per second,

$N=P / E$

$=\frac{2 	imes 10^{-3}}{6.63 	imes 10^{-34} 	imes 6 	imes 10^{14}}=0.05 	imes 10^{17}=5 	imes 10^{15}$

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

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