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Monochromatic light of frequency 6.0 xx ...

Monochromatic light of frequency `6.0 xx 10^14` Hz is produced by a laser. The power emitted is `2.0 xx 10^(-3)` w.

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Energy of each photon
`E=hv=6.63 xx10^-34xx6.0xx10^14 = 3.98 xx 10^-19 J`
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