Physics · Sound
Considering the minimum distance required to hear a distinct echo in air at room temperature (around 17.2 meters), which of the following scenarios will NOT produce an echo?
- 1A tall building at a distance of 30 m
- 2A wall at a distance of 10 m✓
- 3A mountain at a distance of 50 m
- 4A cliff at a distance of 100 m
Correct answer
A wall at a distance of 10 m
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