Question

Calculate the mass of a photon with wavelength 3.6$A^0$. Name the principle/equation/concept used. ($1A^0=1\times {10}^{-10}m$, speed of light$=3\times {10}^8{ms}^{-1}$, $h=6.626\times {10}^{-34}JS$) 03

Answer 1

$\frac{hc}{\lambda }=m{c}^2$

$m=\frac{h}{\lambda c}$

$=\frac{6.626\times {10}^{-34}}{3.6\times {10}^{-10}\times 3\times {10}^8}$

$=\frac{6.626}{3.6\times 3}\times {10}^{-32}$

$=0.61\times {10}^{-32}kg$