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which, as you can see, depends on the displacement amplitude of the wave, vy,,,. The rate of energy transmission for longitudinal waves is: 1 5 ¢ Pavg = 5/)Al'w".s~,"" which, as you can see, also depends on the displacement amplitude of the wave, s;,. And, when a surface of arca A intercepts a sound wave, we can find the intensity, I, of the wave: I=h=—)t"‘ 2.2 A PP Sm Which depends on displacement amplitude, s,,,. What does that mean? it means that when your ears intercept a sound (longitudinal) wave, your eardrums oscillate with the displacement amplitude s,, of the wave you hear, and the intensity, which depends on the square of that displacement amplitude, is used to define the sound level: 1 3 = 10dB log,, (1—) 0 s v . Y . . . ~