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How many photons of light with wavelengt...

How many photons of light with wavelength 400 nm can provide 1 J energy? `[h=6.626xx10^(-34)J*s]`

Text Solution

Verified by Experts

Energy of 1 photon=hv=`(hc)/(lamda)`
`=(6.626xx10^(-34)xx3xx10^(8))/(400xx10^(-9))J" "[because1nm=10^(-9)m]`
`therefore` No. of photons required to produce 1.0 J energy
`=(1.0)/((6.626xx10^(-34)xx3xx10^(8))//(400xx10^(-9)))`
`=(400xx10^(-9))/(6.626xx10^(-34)xx3xx10^(8))=2.012xx10^(18)`.
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