In gases a sound wave is

Sound waves having the following frequency audible by a human being are:

Hz is the unit of

The separation between two successive crests in a wave is

If the distance between a crest and its consecutive trough is L, then the wavelength of the wave is given by

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

Through what type of media, can (i) the transverse waves and (ii) the longitudinal waves be transmitted? Give reason.

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

The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?

Name two sound waves inaudible to human beings. Give the range of their frequencies.

It is observed that some animals get disturbed before earthquake. How?

What is hearing aid? Briefly describe its working principle.

What are ultrasonic? Give two applications of ultrasonic waves.

List in tabular form to distinguishing features between longitudinal waves and transverse waves. Give an example of each.

Distinguish between mechanical and electromagnetic waves.

What do you understand by the terms supersonic speed, shock waves and sonic boom?

Explain how a sonic boom is produced.

What is reverberation? How is reverberation controlled in an auditorium?

A stone is dropped from the top of a tower 500 m high into a pond of water at the base of the tower. When is the splash heard at the top? Given, g = 10 m s^–2 and speed of sound = 340 m s^–1.

Define the terms time period and frequency of an oscillating body. Give their units and write the relation between them.

What is an echo? Give the conditions for the production of an echo.