Question

The approximate wavelength associated with a gold ball weighing 200 gm and moving at a speed of 5 m/h is in the order of ?

• A. ${10}^{-1}m$
• B. ${10}^{-20}m$
• C. ${10}^{-30}m$
• D. ${10}^{-40}m$

Answer 1

The correct option is C ${10}^{-30}m$

Using de-Broglie equation,
$\lambda =\frac{h}{mv}$
$=\frac{6.625\times {10}^{-34}}{0.2\times 5}\times 3600$
$=2.385\times {10}^{-30}$
This is in the order of $\approx {10}^{-30}m$