It is the science of sound waves.

a.Acoustic
b.Waves
c.drumstick
d.echo

Sound waves are compression waves. They're also called longitudinal waves because the air vibrates along the same direction as the wave travels. ... Animation of a transverse wave (how light and water waves travel). Animation of a longitudinal wave (how sound waves travel).

Explanation:

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KaiOiviz KaiOiviz · Answer 2

Answer: D

echo is the answer

Explanation: Sound waves is all about vibration.The source of a sound vibrates, bumping into nearby air molecules which in turn bump into their neighbours, and so forth. This results in a wave of vibrations travelling through the air to the eardrum, which in turn also vibrates.

Echoes. An echo is a sound that is repeated because the sound waves are reflected back. Sound waves can bounce off smooth, hard objects in the same way as a rubber ball bounces off the ground. Although the direction of the sound changes, the echo sounds the same as the original sound.

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