Question

An electron and a photon each have a wave length $1$ nm. Find the energy pf the photon.

Answer 1

Wavelength$=1\ast {10}^{-9}m$

Plancks constant,$h=6.63\ast {10}^{-34}Js$

Energy,$E=\frac{hc}{\lambda }$

$c=3\ast {10}^8\frac{m}{s}$

$E=\frac{6.63\ast {10}^{-34}\ast 3\ast {10}^8}{1\ast {10}^{-9}\ast 1.6\ast {10}^{-19}}=1243.1eV$