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A-LevelPhysicsWaves9702/12 · Feb/Mar 2024 · Q281 Mark

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?

A1.3P

B5.3P

C12P

D48P

✓ Correct answer

B: 5.3P

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About this question

Topic: Waves, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2024 Paper 1 Variant 2, question 28.

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