Your perception. All sound is the result of a medium being compressed at different levels. Speakers can produce noise, static and music all with the same action.
Firstly they are in the frequency range that the human ear can hear. Then they are generally pure sinusoidal vibrations to be pleasant to listen to, not scratchy jagged waveforms. Music itself has...
Light waves travel much faster.Also, sound waves are waves of compression that move through matter (usually air, but water and solids work too!). Whereas light waves are part of the electromagnetic...
Sound is a longitudinal wave and a light wave is a transverse wave. Sound requires a medium to travel through but light can propagate without any medium.
