The sound waves from the train can be heard loudly and clearly at night. The distance of the sound waves are further apart at the top than at the ground level. | IGCSE Board

The sound waves from the train can be heard loudly and clearly at night. The distance of the sound waves are further apart at the top than at the ground level.

Explain why this situation occurs, and state how this leads to the sound being loud and clear.

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Hey Karmun,


  • At night ground cools quickly, ground has low specific heat capacity. Hence, the air layer near the ground is colder and low temperature. Cold air denser than warm air, sound travels faster in warm air. This makes refraction of sound wave occurred and sound that loud and clear bends towards observer.

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