Question

A $200g$ cricket ball is thrown with a speed of $3.0\times {10}^{3}cm$ ${sec}^{-1}$. What will be its de Broglie's wavelength?
$(h=6.6\times {10}^{-27}g{cm}^2{sec}^{-1})$.

• A. $1.1\times {10}^{-32}cm$
• B. $2.2\times {10}^{-32}cm$
• C. $0.55\times {10}^{-32}cm$
• D. $11.0\times {10}^{-32}cm$

Answer 1

Answer: (A)

$1.1\times {10}^{-32}cm$

According to de Broglie equation,
$\lambda =\frac{h}{mv}$
$\lambda =\frac{6.6\times {10}^{-27}g{cm}^2{sec}^{-1}}{200g\times 3.0\times {10}^{3}cm}{sec}^{-1}$
$\lambda =1.1\times {10}^{-32}cm$