Question

The speed of the sound in air is 344 m/s and the time required to hear an echo is 0.1 s, then the minimum distance required between the source and the reflecting surface to hear an echo is *​

Answer 1

Explanation:

Hence, the total distance covered by the sound from the point of generation to the reflecting surface and back should be at least (344 m/s) ×0.1 s = 34.4 m. Thus, for hearing distinct echoes, the minimum distance of the obstacle from the source of sound must be half of this distance. I.e., 34.4/2 = 17 m.

Answer 2

Answer:

17.05 meters

Explanation:

Formula to find distance is

2d = v * t

2d = 344 * 0.1

d = 34.1/2

d = 17.05

Distance is 17.05 meters