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Nuclear Fusion

What is the k...

Question

What is the kinetic energy of an electron in electronvolts with mass equal to double its rest mass?

A

511 K e v

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B

250 k e v

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C

750 K e v

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D

1500 K e v

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Solution

The correct option is A $511 K e v$
Given : $m = 2 m_{o}$
Rest mass energy of electron $m_{o} c^{2} = 511$ KeV
Kinetic energy of electron $K = (m - m_{o}) c^{2}$
$∴$ $K = (2 m_{o} - m_{o}) c^{2} = m_{o} c^{2} = 511$ KeV

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