The de Broglie wavelength associated with a ball of mass 150 g travelling at $30 \mathrm{~m} \mathrm

Question

The de Broglie wavelength associated with a ball of mass 150 g travelling at $30 \mathrm{~m} \mathrm{~s}^{-1}$ is

Professor PC Thomas Classes · Answer

(a) : Mass of the ball, $m=150 \mathrm{~g}=0.15 \mathrm{~kg}$, Speed of the ball, $v=30 \mathrm{~m} \mathrm{~s}^{-1}$ Momentum, $p=m v=0.15 	imes 30=4.5 \mathrm{~kg} \mathrm{~m} \mathrm{~s}^{-1}$ de Broglie wavelength,\  $ \lambda=\frac{h}{p}=\frac{6.63 	imes 10^{-34}}{4.5}=1.47 	imes 10^{-34} \mathrm{~m} $