Question

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Answer 1

Answer:

There Must be a vibrating body which should be capaable of transfering it's energy to it's sourrdings. there Must be a material meduim to pick up energy and then propgate it in Frword direction

Explanation:

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Answer 2

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.