In a slinky (i.e., a long spring) which of the following type of waves can be generated?

Hz is the unit of

If a wave completes 20 vibrations in 2.5 s, then its frequency is

The reciprocal if frequency is

A boat at anchor is rocked by waves whose crests are 100 m apart and whose velocity is 25 m/s/ How often do the crests reach the boat?

Why are sound waves called mechanical waves?

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

Write two points of difference between sound wave and light wave.

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

Define wave number.

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.

What is the audible range of frequency?

Distinguish between mechanical and electromagnetic waves.

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.

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?

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.