Introduction to Waves

Q.

State two differences between the light and sound waves.

Q.

Examples of transverse wave and longitudinal wave

Q.

A sound wave is a mechanical wave, not an electromagnetic wave. This means that

1. particles of the medium move perpendicular to the direction of energy transport

2. a sound wave transports its energy through a vacuum

3. particles of the medium regularly and repeatedly oscillate about their rest positions

4. a medium is required for sound waves in order to transport energy

Q.

The SI unit of frequency is _________.

Q.

What are mechanical waves ?

Q.

What are the characteristic(s) of a wave?

1. An oscillation that propagates through the medium

2. Accompanied by energy transfer

3. All of the above

4. A disturbance that propagates through the medium

Q.

The town hall building is situated close to Boojho’s house. There is a clock on the top of the town hall building which rings the bell every hour. Boojho has noticed that the sound of the clock appears to be much clearer at night. Explain.

Q.

A wave is produced by the periodic disturbance at a point in a medium.

1. True

2. False

Q.

The velocity of the disturbance transmitted in a medium is called ___ .

Q.

When a disturbance creates oscillations perpendicular (at right angles) to the propagation of the wave, they give rise to transverse waves.

1. True

2. False

Q.

Higher the density of the medium _________ is the speed of the sound.

Q. The sound waves arewhile the light waves arein the medium of air.

1. longitudinal
2. transverse
3. infrared
4. horizontal

Q.

Which of the following is never transferred in a wave?

1. Particle

2. both A and B

3. Information

4. Energy

Q.

The vibrating body while playing a violin is

1. mainly wire

2. the box of the violin

3. both wire and box

4. only air

Q.

What is the relation between the frequency and time period of a wave?

Q.

What do you understand by a sound wave?

Q. Frequency of a wave is equal to the inverse of its _________.

1. wavelength
2. time period
3. amplitude
4. loudness

Q. Sound propagates in air as:

1. Longitudinal waves
2. Transverse waves
3. (a) and (b) above.
4. None of the above

Q.

Which section of the ear contains three Ossicles?

Q.

Which of the quantities get transferred during the propagation of a wave:

1. A dog running

2. A ball being thrown

3. Ripple in a pond

4. Kid jumping rope

Q.

Are sea waves completely transverse waves?

Q.

A wave is?

1. a disturbance that propagates through the medium

2. an oscillation that propagates through the medium

3. accompanied by energy transfer

4. All of the above

Q.

What is the relation between time period and frequency?

Q. Waving a hand means "hand acts as a wave"

1. True
2. False

Q.

What is a sound wave?

1. A disturbance that propagates through the medium

2. An oscillation that propagates through the medium

3. It is accompanied by energy transfer

4. All of these

Q.

Sound needs a ____________ for its propagation.

Q. If T represents the time period of a wave, the time taken for one compression to cross a fixed point will be equal to .

1. $\text{T}$
2. $0.5\text{T}$
3. $2\text{T}$
4. $0.25\text{T}$

Q.

Can sound travel through a vacuum?

Q.

What is common to all electromagnetic radiations?

1. They travel at the same speed in a vacuum (empty space), follow laws of reflection and refraction are deflected by electric and magnetic fields.

2. They travel at the different speeds in all media including vacuum (empty space), follow laws of reflection and refraction are not deflected by electric and magnetic fields.

3. They travel at the same speed in a vacuum (empty space), do not follow laws of reflection and refraction are not deflected by electric and magnetic fields.

4. They travel at the same speed in a vacuum (empty space), do not follow laws of reflection and refraction are deflected by electric and magnetic fields.

5. They travel at the same speed in a vacuum (empty space), follow laws of reflection and refraction are not deflected by electric and magnetic fields.

Q.

What is the difference between mechanical and non mechanical wave?