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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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Most popular questions from this chapter

Determine:

a. The speed of a 300eVelectron.

b. The speed of a 3.5MeVH+ion.

c. The specific type of particle that has 2.09MeVof kinetic energy when moving with a speed of 1.0×107m/s.

Electrons pass through the parallel electrodes shown in FIGURE EX37.9 with a speed of 5×106m/s. What magnetic field strength and direction will allow the electrons to pass through without being deflected? Assume that the magnetic field is confined to the region between the electrodes.

4. What was the significance of Thomson’s experiment in which an off-center electrode was used to collect charge deflected by a magnetic field?


Event A occurs at spacetime coordinates (300 m, 2 s)

a. Event B occurs at spacetime coordinates (1200 m, 6 μs). Could A possibly be the cause of B? Explain.

b. Event C occurs at spacetime coordinates (2400 m, 8 μs). Could A possibly be the cause of C? Explain.

FIGURE Q36.6 shows a rocket traveling from left to right. At the instant it is halfway between two trees, lightning simultaneously (in the rocket’s frame) hits both trees.

a. Do the light flashes reach the rocket pilot simultaneously? If not, which reaches her first? Explain.

b. A student was sitting on the ground halfway between the trees as the rocket passed overhead. According to the student, were the lightning strikes simultaneous? If not, which tree was hit first? Explain.
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