Question

The wavelength associated with a golf ball weighing 200g and moving at a speed of 5m/h is of the order

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

Answer 1

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

We can use de Broglie's work to solve this:
$\lambda =h/p;p=mv$
Convert m, v to SI units, use $h=6.6\ast {10}^{-34}$
And you get the order to be approximately be ${10}^{-30}$