How long will it take to hear the echo if the obstacle is 85 m away from the person? Sound speed in air 340 m / s

univerkov | January 5, 2021 | education

In order to hear an echo, it is necessary that the sound travels from the speaker to the obstacle and back, so the entire distance will be:
1) 85 * 2 = 170 (m).
To find the time, we use the ratio: t = S / V, we get:
2) 340/170 = 2 (s).
Answer: the echo can be heard after 2 seconds.

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