An electron has a mass of `9.1 xx 10^(-31)kg`. It revolves round the nucleus in a circular orbit of radius `0.529 xx 10^(-10)` metre at a speed of `2.2 xx 10^(6) m//s`. The magnitude of its linear momentum in this motion is

Options

A. `1.1 xx 10^(-34) kg-m//s`
B. `2.0 xx 10^(-24) kg-m//s`
C. `4.0 xx 10^(-24) kg-m//s`
D. `4.0 xx 10^(-31) kg-m//s`

Answer

B

Explanation

Linear momentum `= mv = 9.1 xx 10^(-31) xx 2.2 xx 10^(6)`
`2.0 xx 10^(-24) kg-m//s`