Calculate the mass of a photon of sodium light wavelength `600` and velocity `3 xx 10^(8)m s^(-1)`.

Explanation

Wavelength of photon
`lambda = 600 xx 10^(-9) m = 6.0 xx 10^(-7)m`
Velocity of photon `(v) = 3 xx 10^(8) m s^(-1)`
Using relationship
`m = (h)/(c lambda)`
we get
Mass of photon `= (6.626 xx 10^(-34) J s)/( 3 xx 10^(8) ms^(-1) xx 6.0 xx 10^(-7) m)`
`= 3.68 xx 10^(--36) kg`