(a) Why are sound waves called mechanical waves ? List two practical applications of reflection of these waves. (b) A stone is dropped from the top of a tower 125 m high into a pond of water at the base of the tower. When is the splash heard at the top ? (g = 10 m/s2 and speed of sound = 340 m/s)
Electromagnetic waves do not require a medium in order to transport their energy. ... Because mechanical waves
rely on particle interaction in order to transport their energy, they
cannot travel through regions of space that are void of particles
