Lakhmir Singh and Manjit Kaur Solutions for Chapter: Sound, Exercise 23: Long Answer Type Questions

What is sound? What type of waves are sound waves in air?

Describe an experiment to show that sound cannot pass through a vacuum?

How does sound from a sound-producing body travel through the air to reach our ears? Illustrate your answer with the help of a labelled diagram.

Why cannot a sound be heard on the moon? How do astronauts talk to one another on the surface of the moon?

A body vibrating with a time period of $\frac{1}{256} \mathrm{s}$ produces a sound wave which travels in the air with a velocity of $350 {\mathrm{ms}}^{-1}$. Calculate the wavelength.

A worker lives at a distance of $1.32 \mathrm{km}$ from the factory. If the speed of sound in the air be $330 {\mathrm{ms}}^{-1}$, how much time will the sound of factory siren take to reach the worker?

The flash of a gun is seen by a man $3 \mathrm{s}$ before the sound is heard. Calculate the distance of the gun from the man (Speed of sound in air is $332 {\mathrm{ms}}^{-1}$).

How could you convince a small child that when you speak, it is not necessary for air to travel from your mouth to the ear of a listener?