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The mass of an electron at rest is 9.1 x...

The mass of an electron at rest is `9.1 xx10^(-31)` kg. the mass of an electron, when it is moving with a speed of `2.4xx10^(8)` m/s is `(c=3xx10^(8) m//s)`

A

`1.517xx10^(-31)` kg

B

`15.17xx10^(-31)` kg

C

`151.7xx10^(-31)` kg

D

`1517xx10^(-31)` kg

Text Solution

Verified by Experts

The correct Answer is:
B
`m=m_(0)/sqrt(1- v^(2)/c^(2))=(9.1xx10^(-31))/sqrt(1-((2.4xx10^(8))/(3xx10^(8)))^(2))`
`=15.17xx10^(-31)` kg
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