Physics · Sound
For an echo to be heard clearly, the reflecting surface should be at least how far from the listener? (Take speed of sound ≈ 340 m/s)
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 134 m
- 250 m
- 317 m✓
- 4100 m
Correct answer
17 m
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