Question

When a sound is reflected from a distant object, an echo is produced and heard on a winter night. Will you hear the echo of the same sound on a summer day if the distance between reflecting surface and the source of the sound remains the same. Justify your answer.

Answer 1

no we cannot hear that echo on a summer day as because summer days has huge humidity and thus the air has many particles which act as a barrier for the echo to be reflected fully .

Answer 2

Answer:

No, the echo will take different times to reach our ears in winter and summer.

Explanation:

Speed of sound in air is given by the formula,

$v=\sqrt{\frac{\gamma RT}{M}}$

where, $\gamma$ is the specific heat ration of the gas\air,

$R$ is the gas constant,

$M$ is the molecular mass of the gas,

and $T$ is the temperature of the gas.

We can see that, $v\propto \sqrt{T}$

This means that the speed of the sound in the air depends directly on the temperature. In winter, when the temperature of the medium is less, the speed of the sound is less too.

In summer, as the surrounding temperature is more, so is the speed.

Therefore, for the echo, if the reflecting surface is kept at the same distance, in winter sound will take more time to travel, and the echo will be heard in more time than it will be in the summer.

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