1.

Calculate the mass of the photon with wavelength of 5pm.

Answer»

Given \(\lambda\) = 5pm = 5 x 10-12 m

Velocity of photon = Velocity of light= 3.0 × 108m/sec.

\(\therefore\) \(\lambda\) = \(\frac{h}{mv}\)

or m = \(\frac{h}{\lambda v}\) = \(\frac{6.626\times10^{-34}Js}{5\times10^{-12}m\times3.0\times10^8m/sec}\)

= 4.417 × 10−27Kg


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