An astronaut cannot hear his companion on the surface of the Moon because

How do you account for the fact that two strings can be used to give notes of the same pitch and loudness but of different quality?

$A$ girl is sitting in the middle of a park of dimension $12 \,m \times 12 \,m$. On the left side of it there is a building adjoining the park and on the right side of the park,there is a road adjoining the park. $A$ sound is produced on the road by a cracker. Is it possible for the girl to hear the echo of this sound? Explain your answer.

If the density of a medium through which sound is propagating is minimum,then this point is called:

$A$ continuous disturbance is created on the surface of water in a ripple tank with a small piece of cork floating on it. Describe the motion of the cork. What does this tell us about the disturbance?

What is a transverse wave?