Chapter 30, Problem 4CQ

### 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 two pieces of evidence allowed the first calculation of m e , the mass of the electron?(a) The ratios q e / m e and q p / m p .(b) The values of q e and E B .(c) The ratio q e / m e and q e .Justify your response.

To determine

What pieces of evidence allowed the first calculation of the mass of electron,me ? Justify the answer.

The ratiosqeme andqpmp

The values ofqe andEB

The ratioqeme andqe

Explanation

Formula Used:

The charge to mass ratio for electron was obtained from Thomson's gas discharge tube experiment.

As per the experiment, the value of

qeme ratio isâˆ’1.76Ã—1011C/kg

Also, the chare of electron was obtained from Millikan's oil drop experiment and value ofqe isâˆ’1.602Ã—10âˆ’19C

Calculation:

Mass of electron can be calculated using values of charge to mass ratio and charge for electron.

â€ƒâ€ƒme=qeqeme

We haveqeme=âˆ’1.76Ã—1011C/kg andqe=âˆ’1

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