Question

The speed of sound in air is 320 ms⁻¹ and in a liquid medium it is 1400 ms⁻¹.
(i) How much time will it take in air to cover 1600 m?
(ii) How much distance will it cover in liquid medium in same time?

Answer 1

The time taken to cover the distance is 5 seconds and the distance covered in liquid medium is 7 km.

Explanation:

Speed of sound in air = 320 ms–1

Speed of sound in liquid = 1400 ms–1

• (i) Speed of sound in air:

Distance = speed x time

1600 = 320 x time

Time = 1600 / 320 = 5 seconds

Time taken for sound to cover 1600 m in air = 5 seconds.

• (ii) In liquid medium:

speed = 1400 and time = 5 s

Distance = speed x time = 1400 x 5 = 7000 metres = 7 km

Distance covered by sound in liquid at the same time  = 7 km

Hence the time taken to cover the distance is 5 seconds and the distance covered in liquid medium is 7 km.

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