Question

The wavelength of a moving body of mass 0.1 mg is 3.312 x 10-29 m. Calculate its
kinetic energy ?​

Answer 1

Answer:

hope it helps you....

Explanation:

Wavelength, λ = 3.31 x 10-29 m

Mass, m = 0.1 mg = 10-1 x10-3 x 10-3 kg= 10-7 kg

Planck’s constant, h = 6.626 x 10-34 Js

Kinetic energy = ?

According to de-Broglie equation,

λ = h / m v

Or v = h / m λ

= 6.626 x 10-34 Js / 10-7 kg x 3.31 x 10-29m

v = 2 x 10-2

Kinetic energy = 1 / 2 mv2

= 1 / 2 x 10-7 x (2 x 10-2)2

Kinetic energy = 2 × 10-3 J