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(ii) emitting and detecting Pellaclio(iii) emitting and detecting reflection of infrasonic wave(iv) all of the aboveB. When you shout inside an empty hall, you hear your own sound after ashort time,why does ithappen? |
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Answer» When we shout inside an empty hall, we hear our own sound because of the echo. As the room is empty, so there is no object which can absorb our sound. |
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