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Physics (AS & A Level) · May / June 2024 · Paper 13 · Question 15

9702Energy conservation

In many filament lamps, as much as 92 J of energy is emitted as thermal energy for every 8 J of energy emitted as light. What is the efficiency of a filament lamp, as the percentage of electrical energy converted to light energy?

  1. A8%
  2. B9%
  3. C91%
  4. D92%

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Correct answer: A. 8%

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