state two application of echo and define mechanical sound wave
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1)the minimum distance b/w u nd the reflector shud be 17m.
2)the sound produced shud be loud enough so that after reflection it could be audible.
Mechanical sound waves need a medium for propagation so the are termed as mechanical sound waves.
2)the sound produced shud be loud enough so that after reflection it could be audible.
Mechanical sound waves need a medium for propagation so the are termed as mechanical sound waves.
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