Mechanical Waves - Short Questions With Answer | Physics Class 12

Short Answer Question | Physics
Short Question-Answer from Mechanical Waves
Class: 12

1. Why sound made at a distance can be heard distinctly at night than in the day time?

Ans. At night, the atmospheric air becomes more moist than at the day time, which reduces the density of air in the night time. As it is known, the velocity of sound is inversely proportional to the square root of the density (i.e. vs 1/ρ). So, at night velocity of sound is more at night than at day due to reduced density of air. Apart from this, the sound absorbing bodies such as people, vehicles and noise from other sound producing bodies are least at night time as compared to the day time. So sound made at a distance can be heard more distinctly at night than at the day time.

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