Physics · May / June 2016 · Paper 12 · Question 35
The diagram represents thermionic emission from a metal filament. The particles are attracted by a charged plate. Which row shows the charge on the plate, and the temperature of the metal filament?
- Acharge on plate: negative; temperature of metal filament: high
- Bcharge on plate: negative; temperature of metal filament: low
- Ccharge on plate: positive; temperature of metal filament: high
- Dcharge on plate: positive; temperature of metal filament: low
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Correct answer: C. charge on plate: positive; temperature of metal filament: high
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