Question

When a sound is reflected from a distant obgect....an echo is heard.let the distance between the reflectin surface and the source of sound production remain same...will u still hear an echo on a hotter day.explain with reason???

Answer 1

on a hotter day, the temperature is high. here, the air particles become more energetic due to the higher temperature and hence sound travels at greater speed. distance remains the same. so echo is heard but after a time less than the time which was needed by the echo on  a normal day( lower temperature). t= d/v

Answer 2

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An echo is heard when the time interval between the original sound and the reflected sound is at least 0.1 s.

The speed of sound in a medium increases with an increase in temperature.

Hence, on a hotter day, the time interval between the original sound and the reflected sound will decrease.

Therefore, an echo can be heard only if the time interval between the original sound and the reflected sound is greater than 0.1 s.

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