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How many photons of lights having a wave...

How many photons of lights having a wave length of `5000 A` are necessary to provide `1` Joule of energy?

Text Solution

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`because " "E=(nhc)/(lambda)`
`therefore n=(Exxlambda)/(hc)`
`=(1"Joule"xx5000xx10^(10)m)/(6.626xx10^(-34)"Joulesec"xx3xx10^(8)msec^(-1))`
`=2.5xx10^(18)` photons
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