In a sound wave, the magnitude of the compression is ___ the magnitude of the rarefaction.

greater than

less than

equal to

At first, I thought it depends on the waveform of the sound ... sine wave,

square wave, sawtooth wave, complex wave, etc. But the magnitude of

the compression must be equal to the magnitude of the rarefaction. It

it weren't, then air molecules would creep along the wave in the direction

of one or the other, and the wave would carry matter as well as energy ...

and we know that waves don't do that.