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

Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child.

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?

What is the audible range of the average human ear?

What is sound and how is it produced?

How are the wavelength and frequency of a sound wave related to its speed?