What is the minimum distance (in metres) required to hear an echo? Options: A . &nbsp10 B . &nbsp13 C . &nbsp17 D . &nbsp21

What is the minimum distance (in metres) required to hear an echo?

Question

What is the minimum distance (in metres) required to hear an echo?

Options:

A . 10

B . 13

C . 17

D . 21

Answer: Option C

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