Chapter 9, Problem 25R

To determine

The part of a longitudinal wave that has lowest density.

Explanation of Solution

Introduction:

The waves in which the particles moves parallel to the direction of propagation of wave is called longitudinal wave.

Longitudinal waves have two-part rarefaction and compression. The compression is the area where the particles’ density is high and the region where the density is lowest is called rarefaction.

Conclusion:

Thus, the part of a longitudinal wave that has lowest density is rarefaction.