3. WHAT IS SOUND
In physics sound is a vibration that
propagates as an acoustic wave
through a transmission medium such
as a gas liquid or solid . In human
physiology and their psychology
sound is reception of such waves
below 20 hz are known as infrasound.
4. HOW SOUND IS TRAVEL
Sound vibration travel in wave move
by vibrating objects and these objects
vibrate other carrying sound sound
can move
Through air water or solids as long as
there are particles to bounce off