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Physics · Oct / Nov 2021 · Paper 12 · Question 36

5054Circuit diagrams and circuit components

The diagram shows an LED connected in a circuit with a resistor and an a.c. power supply of frequency 2.0 Hz. Which statement is correct?

  1. AThe LED does not light.
  2. BThe LED flashes on twice each second and off twice each second.
  3. CThe LED flashes on four times each second and off four times each second.
  4. DThe LED stays on all the time.

As printed in the paper

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Correct answer: B. The LED flashes on twice each second and off twice each second.

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