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The mass of photon having wavelength 1 n...

The mass of photon having wavelength `1 nm` is :

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The correct Answer is:
`m=(h)/(lambdac)=(6.626xx10^(-34)kg m^(2) s^(-1))/((1xx10^(-9)m)(3xx10^(8) ms^(-1)))=2.208xx10^(-33) kg`
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