Sound is a form of energy that produces the sensation of hearing in our ears.

Match the following:
Column A Column B
(a) Vibrations cause (i) absorb sound
(b) A shriller sound is (ii) second
(c) Unit of frequency (iii) sound
(d) Unit of time period (iv) of high pitch
(e) Curtains (v) hertz

What do you mean by a vibratory motion?