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College Physics

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

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BuyFindarrow_forward

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 9.11×1031kg.

Formula used:

Formula to find the rest mass energy is,

  E0=m0c2

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

Calculation:

Substituting the given value, we get,

  E0=(9.11×1031kg)×(3×108ms-1)2=8.199×1014J

Converting unit of energy from joules to mega electron volts.

  E0=8

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