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Find the effective mass of a photon if t...

Find the effective mass of a photon if the wavelength of radiation is `3000Å`.

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Here, `m=? lambda=3000Å=3xx10^(-7)m`
form `E=mc^2, m=E/(c^2)=((hc//lambda))/(c^2)`
`=h/(c lambda)=(6.63xx10^(-34))/(3xx10^8xx3xx10^-7)`
`=7.367xx10^(-36)kg`
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