Chapter 28, Problem 44PE

### 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

# Find the rest energy in joules and MeV of a proton, given its mass is 1.67 × 10 − 27 kg.

To determine

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

Explanation

Given info:

• The mass of proton is 1.67Ã—10âˆ’27â€‰kg.

Formula used:

Formula to find the rest mass energy is,

â€ƒâ€ƒE0â€‰=â€‰m0c2

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

Calculation:

Substituting the given value, we get,

â€ƒâ€ƒE0â€‰=â€‰(1.67Ã—10âˆ’27â€‰kg)Ã—(3Ã—108ms-1)2=â€‰1.503â€‰Ã—10âˆ’10â€‰J

Converting unit of energy from joules to mega electron volts.

â€ƒâ€ƒE0â€‰=1

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