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Calcualte the mass of a photon of sodium...

Calcualte the mass of a photon of sodium light having wavelength ` 5894` Å and velocity ` 3 xx 10^9 ms^(-1) , h = 6. 6 xx 10 ^(-34) kg ^2 s^(-1)`.

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According to de Broglie equation,`lambda =(h)/(mv)`
`lambda = 5894 Ã…= 5894 xx 10^(-10)m, v=3 xx 10^(8) ms^(-1), h= 6.626 xx 10^(-34) kg m^(2) s^(-1)`.
Mass of the photon , `m=(h)/(lambda upsilon)=((6.626 xx 10^(-34)kgm^(2)s^(-1)))/((5894 xx 10^(-10)m) xx (3 xx 10^(8)ms^(-1)))=3.75 xx 10^(-36)kg`
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