Question

q9
select one
what is a region of high pressure in a longitudinal wave called?
an oscillation
a compression
a rarefaction

Explanation:

In a longitudinal wave, particles move parallel to the wave direction. A compression is where particles are close - packed (high pressure), a rarefaction is where they are spread out (low pressure), and an oscillation is the back - and - forth motion.

Answer:

B. A compression