If the electronic charge `e=1.6xx10^(-19)C and ` the specific charge e/m off electron is `1.76xx10^(11)C(kg)^(-1)` then calculate the mass m of the electron.

Options

A. `3.2xx10^(-31)kg`
B. `5.1xx10^(-31)kg`
C. `9.1xx10^(-31)kg`
D. `8.2xx10^(-31)kg`

Answer

C

Explanation

Given, electronic charge, `e=1.6xx10^(-19)C` ltBrgt `(e)/(m)=1.76xx10^(11)Ckg^(-1)`
Mass of electron, `m=(e)/((e//m))`
`=(1.6xx10^(-19))/(1.76xx10^(11))=9.1xx10^(-31)kg`.