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When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day?
An echo is heard when the time interval between the original sound and the sound reflected is . Sound speed in a medium is to the temperature. So, time interval will be to the temperature.
Therefore, on a hotter day, the time interval between the original sound and the sound reflected will .
Hence, on a hotter day, the time interval between the reflected and original sound will decrease and an echo is audible only if the time interval between the reflected sound and the original sound is .
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