Question

De-Broglie wavelength of a body of mass $1$kg moving with velocity of $2000$m$/$s is?

• A. $3.32\times {10}^{-27}\stackrel{o}{A}$
• B. $1.5\times {10}^7\stackrel{o}{A}$
• C. $0.55\times {10}^{-22}\stackrel{o}{A}$
• D. None of these

Answer 1

The correct option is A $3.32\times {10}^{-27}\stackrel{o}{A}$

de Broglie wavelength $\lambda =\frac{h}{mv}=\frac{6.6\times {10}^{-34}}{1\times 2000}$
$=3.3\times {10}^{-37}m=3.3\times {10}^{-27}\stackrel{o}{A}$.