Question

The approximate wavelength associated with a gold-ball weighing 200 g and moving at a speed of 5 m/hr is of the order of

• A. 10–1 m
• B. 10–20 m
• C. 10–30 m
• D. 10–40 m

Answer 1

Answer: (C)

10–30 m

Answer 2

$\lambda = \frac{h}{mv} = \frac{6.625 \times 10^{- 34}}{0.2 \times 5} \times 3600 \approx 10^{- 30}m.$