Question

In a longitudinal wave, a compression is a region of ____________.

• A. low density
• B. high density
• C. low pressure
• D. no pressure

Answer 1

The correct option is B high density

Longitudinal waves propagate in the form of compressions and rarefactions through a medium.
A compression is a region where the particles of the medium are tightly packed together. So, it is a region of high density, and high pressure.
A rarefaction, on the other hand, is a region where the particles of the medium are spread wider. So, it is a region of low density, and low pressure.