Question

An electron has a mass of 9.1 x 10^-31 kg. It revolves round the nucleus in a circular orbit of radius 0.529 x 10^-10 metre at a speed of 2.2 x 10⁶ m/s. The magnitude of its linear momentum in this motion is ____________.

Options

• 1.1 x 10^-34 kgm/s

• 2.0 x 10^-24 kgm/s

• 4.0 x 10^-24 kgm/s

• 4.0 x 10^-31 kgm/s

Answer 1

An electron has a mass of 9.1 x 10^-31 kg. It revolves round the nucleus in a circular orbit of radius 0.529 x 10^-10 metre at a speed of 2.2 x 10⁶ m/s. The magnitude of its linear momentum in this motion is 2.0 x 10^-24 kgm/s.

Explanation:

`"Linear momentum" = "mv"`

` = 9.1 xx 10^-31 xx 2.2 xx 10^6`

` = 2.0 xx 10^-24  "kgm/s"`