Calculate the mass of a photon of sodium light having wavelength 5894 $o A$ and velocity $3 \times 10^{8}$ m/s.
( $h = 6.6 \times 10^{- 34} K g m^{2} s^{- 1}$ )

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Solution

Wavelength $= \frac{h}{m v}$
So $m = \frac{h}{w a v e l e n g t h \times v e l o c i t y}$
Given, $h = 6.6 \times 10^{- 34} K g m^{2} s^{- 1}$
On solving we get
$m$ = $3.37 \times 10^{- 36}$ $K g$

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