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CAIE A-Level Physics AS 7.1.7 Intensity Power Area and Intensity Amplitude 2 Questions

Calculate wave intensity as power per unit area and relate intensity to the square of amplitude.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • Calculate wave intensity as power per unit area and relate intensity to the square of amplitude.

CAIE A-Level Physics AS 7.1.7 Intensity Power Area and Intensity Amplitude 2 Questions question 1

[Maximum number: 1]

A plane wave of amplitude A is incident on a surface of area S placed so that it is perpendicular to the direction of travel of the wave. The energy per unit time reaching the surface is E.

The amplitude of the wave is increased to 2 A and the area of the surface is reduced to 12S\frac{1}{2} S.
How much energy per unit time reaches this smaller surface?

A

4 E

B

2 E

C

E

D

12E\frac{1}{2} E

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