Question

The de Broglie wavelength of a tennis ball of mass 60 g moving with a velocity of 10 metres per second is approximately_______.

• A. ${10}^{-33}m$
• B. ${10}^{-31}m$
• C. ${10}^{-16}m$
• D. ${10}^{-25}m$

Answer 1

The correct option is A ${10}^{-33}m$

de Broglie wavelength is given as; $\lambda =\frac{h}{mv}$ , where m= mass = 0.06kg , v = velocity = 10s
& h = Planck's constant = $6.6\times {10}^{-34}$ J-s
Therefore $\lambda =\frac{6.6\times {10}^{-34}}{0.06\times 10}=1.1\times {10}^{-33}m$