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4.3.3 Action and use of circuit components

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Question 44

In a cathode-ray tube, thermionic emission at the cathode produces electrons, which are then accelerated toward the anode in a vacuum. To operate the tube, two different potential differences are required: one to heat the filament (to emit electrons) and another to accelerate the electrons.

Which combination represents suitable values for these two potential differences?

A

Filament heating voltage: 6 V6\text{ V}6 V d.c.; Cathode-to-anode voltage: 6 V6\text{ V}6 V a.c.

B

Filament heating voltage: 6 V6\text{ V}6 V a.c.; Cathode-to-anode voltage: 2000 V2000\text{ V}2000 V d.c.

C

Filament heating voltage: 2000 V2000\text{ V}2000 V d.c.; Cathode-to-anode voltage: 6 V6\text{ V}6 V d.c.

D

Filament heating voltage: 2000 V2000\text{ V}2000 V a.c.; Cathode-to-anode voltage: 2000 V2000\text{ V}2000 V a.c.

Markscheme

4.3.3 Action and use of circuit components Questions

  1. IGCSE
  2. /Physics
  3. /4.3.3 Action and use of circuit components

67 exam-style questions on CIE IGCSE Physics 4.3.3 Action and use of circuit components. Each one has a worked solution and a mark scheme showing where the marks go.

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