In which of the three media,air,water,or iron,does sound travel the fastest at a particular temperature?

Give two practical applications of reflection of sound waves.

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.

An echo is heard in $3 \,s$. What is the distance of the reflecting surface from the source,given that the speed of sound is $342 \,m \,s^{-1}$ (in $,m$)?

Explain how the human ear works.

What is the audible range of the average human ear?