Distinguish between a compression and a rarefaction?

Question

Please be sure to mention the type of wave in which these regions occur.

Answer 1

The most typical example of this kind of waves are the sound waves, propagating in any medium. If no sound the density of medium d=constant through out the whole volume. If sound then d1=d+delta means compression, d2=d-delta rarefaction. If d1 & d2 alternate along the path of the wave with certain period we can describe it in terms of sine/cosine, delta being its amplitude. The alternation of d1/d2 occurs because of inertia of medium molecules.

Answer 2

it extremely is actual that the intensity of sound is proportional to the two the sq. of the amplitude (A ^ 2) as nicely using fact the sq. of the frequency( f ^2) for the reason that sound wave is a mechanical wave. yet frequency could effect in basic terms whilst the source is seen. i.e. the intensity of sound could be laid low with the frequency on condition that the frequency of the source which produces the sound is replaced/different. For a valid wave that's vacationing in air, in basic terms the amplitude could substitute the intensity of the wave; not frequency. in spite of the undeniable fact that the amplitude of the wave reduces(which in turn decreases the vibrations), the frequency won't substitute(presented that it travels in basic terms by way of air). Frequency is the variety of waves passing a undeniable element according to unit time; it does not have any relationship with amplitude. So whilst amplitude cut back, the intensity of the sound wave decreases and motives the sound to vanish away(much less vibration of debris).