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Chapter 37: Q. 8 (page 1081)

The current in a Crookes tube is 10nA. How many electrons strike the face of the glass tube each second?

Short Answer

Expert verified

The number of electrons are = 6.25×1010electronss

Step by step solution

01

Given Information

We have been given that current in a Crookes tube is 10nA. We need to find the number of electrons that strike the face of the glass tube each second.

02

Simplify

By the definition of current, we know

- (1)

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

We are given that I=10nA

Since I= Δq/Δt, 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 is1.6×10-9C

Substituting the values in equation(1), we get

10nA=10nCS

On solving,

Number of electrons =

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