Question

The de-Broglie wavelength of a particle with mass 1gm and velocity 100m/sec is

• A. 6.63 × 10^-33 m
• B. 6.63 × 10^-34 m
• C. 6.63 × 10^-35 m
• D. 6.65 × 10^-35 m

Answer 1

The correct option is A

6.63 × 10^-33 m

From De - Broglie wavelenght, we know

$\lambda$ = $\frac{h}{p}$ $\Rightarrow$ $\lambda$ = $\frac{h}{mv}$

Here m = 1gm

v= 100 m/s

$\Rightarrow$ $\lambda$ = $\frac{6.63\times {10}^{-34}}{{10}^{-3}\times 100}=6.63\times {10}^{-33}m$