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Due to total internal reflection of sound, sound is heard distinctly at night than during day time.

By day time due to sunlight, the air near the surface of the earth is hotter than the atmospheric air above. Then the lower layer of the air acts as rarer medium and the sound on the surface of the earth is refracted to upper layer.

But by night the upper layer of the atmosphere is hotter than the lower layer. Hence, the sound waves are totally reflected back to the surface. Thus, the sound is heard more distinctly in night-time than in night-time.

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Related Questions

Why is it louder when the sound is at night?

At night, the ambient noise levels are typically lower due to fewer people being active and background noise from traffic decreasing. This can make sound sources appear louder in comparison. Additionally, sound waves can travel further at night due to cooler air temperatures, allowing the sound to carry over longer distances.


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Sound is often louder at night because there is less ambient noise and activity, allowing sound waves to travel further without interference. This can make sounds seem louder and more noticeable in the quiet of the night.


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All things being equal, the amount of noise a weapon makes with the same ammunition should be the same. A gunshot may SEEM louder at night mostly because there is a lot less noise from other sources in the night. The decrease in background noise can allow the sound of a gunshot to carry much further.


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Any/every material can carry sound.


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At night, sound waves travel through a quieter environment with less background noise, making them seem louder in comparison. Additionally, cooler air at night can cause sound to travel further and more clearly, contributing to the perception of increased volume.


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