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A person rings a bell near a concrete wall and hears its echo after 0.3 seconds. If sound travels at 340 m/s, how far away is the wall?

1. A person rings a bell near a concrete wall and hears its echo after 0.3 seconds. If sound travels at 340 m/s, how far away is the wall?

 

The sound travels to the wall and back in 0.3 s, so one-way distance = (340 × 0.3) ÷ 2 = 51 metres.

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