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Sound — Physics STD 10 — Question

ICSE BoardEnglish MediumSTD 10PhysicsSound1 Mark
Question
A person standing between two cliffs hears two echo one after 3 sec and another after 4 sec , so time taken for first echo is __________ [$4s/3s]$ and that for second echo is ____________ [3s/4s].
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Answer

3s, 4s

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