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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 remain the same. Do you hear echo sound on a hotter day ?

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The speed of sound increases on a hotter day (when the temperature is high) and it requires a larger distance from the reflecting surface for the echo to be heard. Since the distance between the reflecting surface and the source of sound remains the same, no echo can be heard on a hotter day.
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