Propagation Of Sound:
- The travelling of sound is called propagation of sound.
- Sound is propagated by the to and fro motion of particles of the medium.
- When an object vibrates, the particles around the medium vibrate. The particle in contact with the vibrating object is first displaced from its equilibrium position. Each particle disturbs the other particle in contact. Thus, the disturbance is carried from the source to the listener.
Describe with the help of a diagram, how compressions and rarefactions are produced in air near a source of sound.
Suppose you and your friend are on the moon. Will you be able to hear any sound produced by your friend?
Name the type of waves which are used by astronauts to communicate with one another on moon (or in outer space).
When we open a gas tap of a few seconds, the sound of escaping gas is heard first but the smell of gas comes later. Why?
The frequency of the sound emitted by the loudspeaker is 1020 Hz. Calculate the wavelength of the sound wave in air in cm where its velocity is 340 m/s.
Define the terms 'frequency', 'wavelength' and 'velocity' of a sound wave. What is the relation between them?