Question

Find the de-Broglie wavelength for a $ 100\, gm $ bullet moving at $ 900\,m/s $ .

• A. $ 3.7 \times 10^{-35} \,m $
• B. $ 7.4 \times 10^{-36} \,m $
• C. $ 7.8 \times 10^{-37} \,m $
• D. $ 8.2 \times 10^{-39} \,m $

Answer 1

Answer: (B)

de-Broglie wavelength
$\lambda = \frac{h}{mv} = \frac{6.6\times 10^{-34}}{0.1 \times 900}$
$ = 7.3 \times 10^{-36} \,m$