Mathematics · Speed, Distance & Sound Acoustics
A student shouts in front of a cliff and hears the reflected sound (echo) after 0.08 s. Given that the speed of sound in air is 340 m/s and the persistence of human hearing is 0.1 s, what can be concluded?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1The cliff is 27.2 m away, but a distinct echo is not heard
- 2The cliff is 27.2 m away and a distinct echo is heard
- 3The cliff is 13.6 m away, but a distinct echo is not heard because time delay is less than 0.1 s✓
- 4The cliff is 13.6 m away and a distinct echo is heard
Correct answer
The cliff is 13.6 m away, but a distinct echo is not heard because time delay is less than 0.1 s
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