Wave 1 has amplitude of $9.0 A_{0}$ and wave 2 has amplitude $4.0 A_{0}$. What is the ratio of their intensities, $I_{1} / I_{2}$ ?
A) 5.1
B) 1.3
C) 2.3
D) 1.5
E) 20

Question

Quizplus · Accepted Answer

The intensity of a wave is proportional to the square of its amplitude. So, the ratio of the intensities of the two waves is:$$I_1 / I_2 = (A_1 / A_2)^2 = (9.0 A_0 / 4.0 A_0)^2 = 5.1$$

Wave 1 Has Amplitude Of 9.0A09.0 A_{0}9.0A0​ And Wave 2 Has Amplitude

Wave 1 Has Amplitude Of $9.0 A_{0}$ And Wave 2 Has Amplitude