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Q.

When a sound is reflected from a distinct object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remain the same. The echo sound on a hotter day is

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a

More

b

Low

c

Negligible

d

None

answer is B.

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Detailed Solution

When a sound is reflected from a distinct object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remain the same. The echo sound on a hotter day is low.
Temperature causes an increase in sound velocity. Thus, on hotter days, the sound velocity in the air increases. As a result, there is a reduction in the time interval between the incident wave and the reflected wave.
The human ear now needs a minimum time interval of

0.1 seconds

to detect an echo. Therefore, on a hotter day, an echo can be heard if the time interval is greater than

0.1 seconds .

However, on a hotter day, the difference in time between the incidence of the original sound and the reflected sound is less than

0.1 seconds

because the sound is moving more quickly. So there is less chance of hearing an echo.

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When a sound is reflected from a distinct object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remain the same. The echo sound on a hotter day is