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.

Exam points

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

[Maximum number: 2]

A longitudinal sound wave is travelling through a solid. The initial intensity of the wave is $I_{0}$ . The frequency of the wave remains constant and the amplitude falls to half of its original value.

Determine, in terms of $I_{0}$ , the final intensity of the wave.

$I \propto A^{2}$ $I=(1 / 2)^{2} I_{0}$

intensity $=0.25 I_{0}$

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