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Physics (AS & A Level) · Feb / March 2021 · Paper 12 · Question 21

9702Progressive waves

A progressive radio wave in a vacuum has a frequency of 75 MHz. What is the phase difference between two points on the wave that are 50 cm apart from each other?

  1. A23°
  2. B45°
  3. C90°
  4. D180°

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Correct answer: B. 45°

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