Question

What will be the wavelength of a ball of mass $0.1\, kg$ moving with a velocity of $10 m\, s^{-1}$ ?

• A. $5.625 \times 10^{-24} \, m^{-1}$
• B. $5.625 \times 10^{34} \, m$
• C. $6.626 \times 10^{-34} \, m$
• D. $66.26 \times 10^{24} \, m^{-1}$

Answer 1

Answer: (C)

According to de Broglie equation,
$\lambda = \frac{h}{mv}= \frac{6.626 \times10^{-34}Js}{0.1 kg \times10 ms^{-1}} $
$= 6.626 \times 10^{-34} \, m (J = kg \, m^2 \, s^{-2})$