Q 12-11-031NEETJEE MainMedium
The de Broglie wavelength of a $1$ kg ball moving at $1$ m/s is of the order of ($h = 6.6 \times 10^{-34}$ J s)
Answer: (C) $10^{-33}$ m
Concept. $\lambda = \dfrac{h}{mv}$.
Step 1. Substitute. $6.6 \times 10^{-34}$ m, of order $10^{-33}$ m (far too small to detect).
Answer. $10^{-33}$ m (Option C).
Solution by Sreeraj P, M.Sc Physics