Question

sound is heard louder at night than days, why?

Answer 1

Answer:

There is a phenomenon called refraction that affects the direction of sound propagation. During the day, the sound bends away from the ground; during the night, it bends towards the ground. Hence at night you have additional "sound" reaching you, making it louder.

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Answer 2

Answer:

Explanation:

Because  at  night, surrounding sound is less than in day.