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What is power (in watt) of a light sourc...

What is power (in watt) of a light source emitting `3.125 xx 10^(18)` photons per second, while the wavelength of light is `620 nm` ? (use `hc = 12400 eVÅ`)

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Verified by Experts

The correct Answer is:
`1`
Let the power be `x` wants.
No. of photons emitted per second `xx` Energy of `1` photon `=` Total energy
`:. 3.125 xx 10^(18) xx (12400)/(6200) = (x)/(1.6 xx 10^(-19)`
`:. x = 1`
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