Question

stions
38. On which day, a hot day or a cold day, an echo is heard sooner? Give reason for your answer.
39. In which medium, air or water, an echo is heard much sooner ? Why?
40. What is reverberation ? What will happen if the reverberation time in a big hall is too long?
41. How can reverberations in a big hall or auditorium be reduced ?
42. Why do we hear more clearly in​

Answer 1

Explanation:

The speed of sound in air increases with increasing temperature. The speed of sound is more on a hot day than on a cold day. Since, the speed of sound is more on a hot day, therefore we will hear an echo sooner on a hot day than on a cold day.

Answer 2

26 July is very hot day and long day