Question

Calculate the wavelength associated with an electron moving with a velocity of ${10}^{10}cm$ per sec.

Answer 1

Mass of the electron $=9.10\times {10}^{-28}g$
Velocity of electron $={10}^{10}$ $cm$ per sec
$h=6.62\times {10}^{-27}erg-sec$
According to de Broglie equation,
$\lambda =\frac{h}{mv}=\frac{6.62\times {10}^{-27}}{9.10\times {10}^{-28}\times {10}^{10}}$
$=7.72\times {10}^{-10}cm$
$=0.0772\mathring{A}$.