Physics · Oct / Nov 2019 · Paper 11 · Question 38
A student suggests four conditions for the production of a continuous flow of electrons from a metal filament. 1 The filament is hot. 2 A high-pressure gas is present. 3 A high positive electrical potential is present. 4 A strong magnetic field is present. Which of the four conditions are needed?
- A1 and 4
- B2 and 3
- C1 and 3
- D2 and 4
As printed in the paper
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Correct answer: C. 1 and 3
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