Q. What is the wavelength of an $\alpha$-particle having mass $6.6 \times 10^{- 27}$ kg moving with a speed of $10^{5}$ cm $s^{- 1}?$ $(h = 6.6 \times 10^{- 34}kg\ m^{2} - s)$
A) $2 \times 10^{- 12}$ m
B) 3$\times 10^{- 10}$ m
C) 1$\times 10^{- 10}$ m
D) $2 \times 10^{- 10}$ m
Explanation
(c)
$\lambda = \frac{h}{mv} = \frac{6.6 \times 10^{- 34}\ kg\ m^{2}s^{- 1}}{6.6 \times 10^{- 27}kg \times 10^{3}{ms}^{- 1}}$
$= 1 \times 10^{- 10}\$m
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.