Question

what is rarefraction????

Answer 1

the same tunning fork when vibrate backward and return they create a area of low pressure which is called as a rarefaction.

Answer 2

Rarefaction is the reduction of an item's density, the opposite of compression. Like compression, which can travel in waves (sound waves, for instance), rarefaction waves also exist in nature. A common rarefaction wave is the area of low relative pressure following a shock wave.