State three conditions necessary for sound to be heard.
Q. State three conditions necessary for sound to be heard.
Ans. (i) There must be a vibrating body which should be capable of transferring its energy to its surroundings.
(ii) There must be a material medium to pick up energy and then propagate it in forward direction.
(iii) There must be a receiver, so as to receive the sound vibration and then transmit it to the brain for final interpretation.
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