Question

Paragraph-1(9-11): If we shout in a big empty hall, we hear again our voice
coming due reflection of sound from wall a little later. This phenomenon is
known as echo. 9. A man standing between two hills makes sound loudly
and receives two echoes after 1 sec and 1.2 sec. The distance between
two hills is (v=330 m/s)​

Answer 1

Answer:

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