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Monochromatic light of frequency 6 xx 10...

Monochromatic light of frequency `6 xx 10^(14)`Hz is produced by a laser. The power emitted is `2.0 xx 10^(-3) W`. How many photons per second on an average are emitted by the source ?

Text Solution

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Power of radiation , `P = ( nhv)/( l) = Nhv`, where N is number of photons per sec.
or `N = ( P)/( m )`
`= ( 2.0 xx 10^(-3))/( 6.63 xx 10^(-34) xx 6 xx 10^(14))`
`= 5 xx 10^(15) ` photons per second
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