Question

The order of wavelength associated with golf ball weighing 200g and moving at a speed of 5mh^-1 is?

Answer 1

Mass:

$$\begin{gathered} m=200\mathrm{g} \\ =\frac{200}{1000} \\ =0.2\mathrm{kg} \end{gathered}$$

Velocity:

$$\begin{gathered} v=5\mathrm{m}/\mathrm{h} \\ =\frac{5}{3600}\mathrm{m}/\mathrm{s} \\ =0.0014\mathrm{m}/\mathrm{s} \end{gathered}$$

De-broglie wavelength:

$$\begin{gathered} \lambda =\frac{h}{mv} \\ =\frac{6.6\times {10}^{-34}}{\left(0.2\right)\left(0.0014\right)} \\ =2.4\times {10}^{-30}\mathrm{m} \end{gathered}$$