PLEASE HELP Question: How do the number of beats relate to the frequencies of the two sound waves?

The beat frequency is always equal to the difference in frequency of the two notes that interfere to produce the beats. So if two sound waves with frequencies of 256 Hz and 254 Hz are played simultaneously, a beat frequency of 2 Hz will be detected. ... These sounds will interfere to produce detectable beats.

Explanation:

layers of the earth affect the waves and these effects are seen on instruiments such as seimometers

d) physical means can be used to separate the components of air.