Question

3.
Give reason:
(a) Sound becomes faint as you move away from the source of sound.
(b) We can't hear the sound produced in outer space.
(c) Bats fly safely in darkness.


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Answer 1

1. As distance from the sound source increases, the area covered by the sound waves increases. The same amount of energy is spread over a greater area, so the intensity and loudness of the sound is less. This explains why even loud sounds fade away as you move farther from the source.

2. On Earth, sound travels to your ears by vibrating air molecules. In deep space, the large empty areas between stars and planets, there are no molecules to vibrate. There is no sound there.

3. Bats fly safely in darkness because these have fine sense of locating echoes. They produce high pitched sounds. The sound bounce off the objects they hit and return to them as an echo. Echo location helps bats to locate objects in darkness and fly safely at night.