Question

give reason
please help me​

Answer 1

Answer:

(1) No, we cannot hear each other on the moon's surface because sound requires medium for transmission. It cannot travel through vacuum.

(2) A sound persists in our ear for 0.1 s . At temperature 22∘  C in air and speed of sound 344 ms  −1 ( It is raised to -1 ) , the total distance covered by sound between the point of generation and reflecting surface should be at least (344 m/s) * 0.1 s = 34.4 m . Thus, the minimum distance between the point of generation and reflecting surface should be half of it i.e. 17.2 m . So, we cannot hear an echo in a small room as the minimum distance for the echo will not be satisfied. But we can hear an echo in a long gallery and big halls.