Question

A boy weighing $20Kg$ is running with a speed of $18km/hr$. What is his de-Broglie wavelength?

Answer 1

18 km /hr = 5 m/s

De broglie wavelength ($\lambda$) $=h/mv$

substituting the value in above equation

$\lambda =\frac{6.626\times {10}^{-34}}{20\times 5}$

$=6.626\times {10}^{-36}$