What is the movement of alternating compressions and rarefactions?

Alternating compressions and rarefactions produce a wave. One compression and one rarefaction is called a wavelength.

Compression happens when molecules are forced, or pressed, together. Rarefaction occurs when molecules are given extra space and allowed to expand.

speed

ratio of distance traveled to time interval

net force

vector sum of forces on object

object

source of diverging light rays either luminous or illuminated

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explanation:

energy can be converted from one form to another, but it cannot be created or destroyed in ordinary chemical or physical means. do not understand what you are asking but hope this