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

Explanation

Wavelength of photon , ` lambda = 5894`
Å `= 5894 xx 10^(10) m`
Velocity fo light ` C= 3 xx 10^8 ms^(-1)`
Mass of photon `= (h)/(clambda) = ( 6.6 xx 10^(-34))/( 3 xx 10^(8) xx 5874 xx 10^(-10))`
` = 3.72 xx 10^(36 ) kg` .