The de-Broglie wavelength of a ball of mass 120 g moving at a speed of 20 m/s is

Question

The de-Broglie wavelength of a ball of mass 120 g moving at a speed of 20 m/s is (A)  3.5 × 10-34 m  (B)  2.8 × 10-34 m  (C)  1.2 × 10-34 m  (D)  2.1 × 10-34 m

Tardigrade Admin · Accepted Answer

de-Broglie wavelength, λ=(h/mv) =(6.6×10-34/120×10-3×20) =2.75×10-34 m

Q. The de-Broglie wavelength of a ball of mass $120 g$ moving at a speed of $20 m / s$ is

$3.5 \times 1 0^{- 34} m$

$2.8 \times 1 0^{- 34} m$

$1.2 \times 1 0^{- 34} m$

$2.1 \times 1 0^{- 34} m$

de-Broglie wavelength, $λ = \frac{h}{m v}$
$= \frac{6.6 \times 1 0 ^{- 34}}{120 \times 1 0 ^{- 3} \times 20}$
$= 2.75 \times 1 0^{- 34} m$

Q. The de-Broglie wavelength of a ball of mass 120g moving at a speed of 20m/s is

3.5×10−34m

2.8×10−34m

1.2×10−34m

2.1×10−34m