Chapter 28, Problem 43PE

### College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000

Chapter
Section

### College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

# What is the rest energy of an electron, given its mass is 9.11 × 10 − 31 kg? Give your answer in joules and MeV.

To determine

The rest mass energy of the electron in unit of joule and MeV.

Explanation

Given info:

• The mass of electron is 9.11Ã—10âˆ’31â€‰kg.

Formula used:

Formula to find the rest mass energy is,

â€ƒâ€ƒE0â€‰=â€‰m0c2

Here, m0is the rest mass of electron and cis the speed of light.

Calculation:

Substituting the given value, we get,

â€ƒâ€ƒE0â€‰=â€‰(9.11Ã—10âˆ’31â€‰kg)Ã—(3Ã—108ms-1)2=â€‰8.199â€‰Ã—10âˆ’14â€‰J

Converting unit of energy from joules to mega electron volts.

â€ƒâ€ƒE0â€‰=â€‰8

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