Mechanical waves
Answer Questions :- 1. Why sound made at a distance can be heard distinctly at night than in the day time? >At night, the atmospheric air becomes moist than at day time. So, density of air at night is less than at day time. But the velocity of sound is inversely proportional to the square root of density i.e., V ∞ 1/ . So, velocity of sound at night is more than at day time due to reduced density of air. Hence, sound made at a distance can be heard distinctly at night than in daytime. 2. Is velocity of sound more in damp air or in dry air? Explain. > In the wet day, the atmospheric air becomes moist than on a dry day. Pressure of moist air reduces its density. We know that the velocity of sound in air is inversely proportional to the square root of the density i.e. V ∞ 1/ ...