Which of the following is carried by the waves from one place to another?

In gases a sound wave is

Hz is the unit of

The reciprocal if frequency is

Sound waves are

Explain how sound is produced by your school bell.

Suppose you and your friend are on the moon. Will you be able to hear any sound produced by your friend?

A person is listening to a tone of 500 Hz sitting at a distance of 450 m from the source of the sound. What is the time interval between successive compressions from the source?

What is the audible range of the average human ear?

Define periodic motion. Give examples.

Derive a relation between wavelength, frequency and velocity of a wave.

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

A Child hears an echo from a cliff 4 seconds after the sound from a powerful cracker is produced. How far away is the cliff from the child? Given that the speed of sound is 340 m/s.

How is ultrasound used for cleaning?

State some important characteristics of wave motion.

Distinguish between mechanical and electromagnetic waves.

Explain how a sonic boom is produced.

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

. A submarine emits a sonar pulse, which returns from an underwater cliff in 1.02 s. If the speed of sound in salt water is 1531 m/s, how far away is the cliff?

We hear a sound when a bell is rung If we touch the ringing bell, we can feel its vibrations.Thus,a source of sound in a sound in a state of vibration.The motion of vibrating source sets up sound in a state of vibration.These sound waves travel through air in the form of compressions and rarefactions producing sensation of hearing in our ears.
Answer the following questions based on the above information:
(a)What is sound?
(b) How is sound produced?
(c) What is the nature of sound waves in air?
(d) What is the separation between two successive compressions in a sound wave?

An average person can hear sounds in the frequency range 20 Hz-20 kHz .Sounds below 20 Hz are called infrasound and those above 20 kHz are called ultrasound The SONAR,a system of sound navigation and ranging ,employs ultrasonic waves and reflaction of sound for deducting and finding the distance of objects under water.
Answer the following questions based on the above information:
(a) What is the audible range of the average human ear?
(b) What is the range of frequency associated with infrasound?
(c) Wite the name of sound having  a frequency associated with infrasound?
(d) What for SONAR ,stands?
(e) Give an application of SONAR.

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.