The low - ___ areas in a sound wave are called rare factions

You can picture a sound wave a lot like a Slinky wave . . . a

thicker, compressed blob moving along the path, with thinner,

stretched-out places before and after it.

The thicker parts of a sound wave, where the air is more dense,

are called compressions.

The thinner parts of a sound wave, where the air is less dense,

are called rarefactions.

Explanation:

spectral lines lyman is one set