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Physics (AS & A Level) · Feb / March 2024 · Paper 12 · Question 28

9702Progressive waves

A beam of light with power P has an area of cross-section A. The amplitude of the light waves in the beam is X. The beam of light is then changed to one with the same frequency but with an increased amplitude of 4X and an area of cross-section reduced to A/3. What is the power of the new beam?

  1. A1.3P
  2. B5.3P
  3. C12P
  4. D48P

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Correct answer: B. 5.3P

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