Question

Calculate the wavelength associated with an electron travelling at one tenth speed of light. $\left(h=6.626 \times 10^{-27} crg \cdot sec , m =9 \cdot 1 \times 10^{-28} g , c =3 \cdot 0 \times 10^{10}\right.$ cm/sec $)$

Answer 1

$\quad \lambda=\frac{h}{p}$, and $p=m v ; \quad v=\frac{1}{10} \times c=3 \cdot 0 \times 10^{9}$

$=\frac{h}{m v}=\frac{6 \cdot 626 \times 10^{-27}}{9 \cdot 1 \times 10^{-28} \times 3 \cdot 0 \times 10^{10}}=0.24 Å \text {. }$