When a sound wave, travelling in a medium bounces back to the same medium after striking the same second medium then _______ occurs.
When sound waves travel from a rarer medium to a denser medium with same elastic properties, its speed:
Bouncing back of light in a given medium after striking a surface is called ______.
Bouncing back of sound into the same medium when it strikes any hard surface is :
(a)refraction (b)reflection (c)either a or b (d)reverberation
When sound waves travel from a rarer medium to a denser medium, its speed