Q. 8
ExpertverifiedThe current in a Crookes tube is . How many electrons strike the face of the glass tube each second?
The number of electrons are =
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.
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 = Δq/Δt, we see that an ampere is one coulomb per second:
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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