What evidence is there to show that sound is a wave motion?

Answer 1

The telephone and your ears. Sound is basically the vibrations of air. Bang a drum, drum vibrates, vibrations cause air to vibrate, vibrations travel in air, reaches ear drum, ear drum vibrates, brain interprets vibration as banging drum.

Answer 2

All waves whether it is sound, light or water, all act the same way. In modern times the frequency and path can be measured very accurately with sensitive microphones or equipment. By placing it in certain areas showing that the sound waves have the same motion as say for instance water waves.

Lions roar at a very low frequency, this helps the sound move over long distances with the lower frequency and longer and higher waves, moving over objects like trees and rocks.

Or simply look at how a speaker generates sound, by forming these very waves by moving backwards and forwards at the same frequency as the sound's being made.

Hope this helps...

Answer 3

There's no way to tell. Except that if you set up experiments capable of

detecting them, you observe that sound exhibits the reflection, refraction,

diffraction, dispersion, constructive and destructive interference that are

characteristics of wave motion and its mathematics.

Answer 4

To be transmitted, vibrations of sound waves need to cross a compressible medium.
Vacuum is not compressible.

Answer 5

It will not travel through a vacuum.