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Q. 8

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
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Short Answer

The current in a Crookes tube is . How many electrons strike the face of the glass tube each second?

The number of electrons are =

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Step by Step Solution

Step 1: Given Information

We have been given that current in a Crookes tube is . We need to find the number of electrons that strike the face of the glass tube each second.

Step 2: Simplify

By the definition of current, we know

-

where is the amount of charge passing through a given area in time

We are given that

Since I = Δqt, we see that an ampere is one coulomb per second:

1 A = 1 C/s

It is known that the charge of a electron e is

Substituting the values in equation, we get

On solving,

Number of electrons =

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