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The photons of light having a wavelength...

The photons of light having a wavelength `4000 Å` are necessary to provide `1.00 J` of energy are.

Text Solution

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Energy of one photon
`=hv=h.(c)/lamda`
`=((6.62xx10^(-34))(3.0xx10^(8)))/(4000xx10^(-10))`
`=4.965xx10^(-19)J`
Number of photons `=(1.00)/(4.965xx10^(-19))=2.01xx10^(18)`.
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