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Cathode Ray Experiment

In a cathode ...

Question

In a cathode ray tube, what is the effect on the beam of particles if a hotter filament is used ?

A

Rate of electron emission remains unchanged

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B

Rate of electron emission decreases

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C

Rate of electron emission increases

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D

Rate of electron emission increases then decreases

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Solution

The correct option is C Rate of electron emission increases
Hotter filament will increase the temperature.
Hence rate of electron emission will increase.

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Similar questions

Q. How can the rate of emission of electrons in a cathode ray tube be increased ?

Q. In a cathode ray tube, state:
(i) the purpose of covering cathode by thorium and carbon.

(ii) the purpose of the fluorescent screen.

(iii) how is it possible to increase the rate of emission of electrons.

Q. A cathode ray tube is used to study the behavior of electrons. As the emitted electrons impact on the fluorescent screen of the tube, they make the surface glow. These individual impacts can be used to count the number of electrons leaving the electron gun of the cathode ray tube each second. A group of students studying the electron emission has compiled a table show below.

time (min)	total number of electron impacts (x 1,000,000)
1	.212
2	.529
3	.711
4	1.12
5	1.70
6	1.91
7	2.09
8	2.51
9	2.71
10	3.10
11	3.21
12	3.71
13	3.79
14	4.20
15	4.67

Based on the data collected, what is the approximate magnitude and direction of the conventional current inside of the cathode ray tube?

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