The distance to the sound-reflecting obstacle is 68m. How long will it take for a person
| August 31, 2021 | education
The distance to the sound-reflecting obstacle is 68m. How long will it take for a person to hear it echo. The speed of sound in the air is 340 m / s?
Initial data: L (distance to the sound-reflecting obstacle) = 68 m.
Reference data: according to the condition, we take V (speed of sound in air) = 340 m / s.
1) The distance that the sound must overcome: S = 2 * L = 2 * 68 = 136 m.
2) The time when a person hears an echo from a sound: t = S / V = 136/340 = 0.4 s.
Answer: A person will be able to hear an echo in 0.4 s.
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