Guess which sound has a higher pitch: guitar or car horn?

What is loudness of sound? What factors does it depend on?

Give two practical applications of reflection of sound waves.

Which wave property determines $(a)$ loudness,$(b)$ pitch?

When a sound is reflected from a distant object,an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear an echo on a hotter day?

Suppose you and your friend are on the moon. Will you be able to hear any sound produced by your friend?