Give reasons: (1) Two friends on the moon cannot hear each other's voices. (2) Echoes cannot be heard in a small room.
Answers
Answer:
1. Because, on the moon there is no air or atmosphere at all. It is all vacuum. Since sound cannot travel through a vacuum, therefore we cannot hear the sound produced by our friend.
2. For an echo of a sound to be heard,the minimum distance between the source of sound and the walls of the room should be 17.2 m. And we. can't hear echo because the sound can't be reflected back.
Answer:
(1) Two friends on the moon cannot hear each other's voices as dound requires medium to travel. There is no atmosphere around the moon.
(2) Echoes cannot be heard in a small room because the time difference between the direct and reflected sounds is too small for the human ear to detect in a small room.
Explanation:
1.
Two friends on the moon cannot hear each other's voices as sound requires medium to travel. There is no atmosphere around the moon so sound waves cannot travel on the moon.
2.Echoes cannot be heard in a small room as time difference between the direct and reflected sounds is too small for the human ear to detect. Since 17.2 m is the smallest distance needed to hear an echo in a small space
The time difference between the original sound and the reflected one must be at least 0.1 seconds for an echo to be audibly audible. When the gap between the source and the obstacle is more than 17.2 metres, this occurs. When the distance between the source and the obstruction is less than 17.2 m, reflected sound in tiny spaces returns before 0.1 seconds. As a result, in small spaces, we cannot clearly perceive echoes.