Wave and Particle Motion of Waves

Q.

Which electromagnetic wave has the shortest wavelength?

Q.

Define the term wave velocity. Write its S.I. unit.

Q. What are crests and troughs in a sound wave? Show the crests and troughs in a diagram of sound of wave.

Q.

How do Electromagnetic waves travel in vacuum?

Q.

(a) What are longitudinal waves and transverse waves ? Explain with the help of labelled diagrams .

(b) Give two examples each of longitudinal waves and transverse waves.

Q.

Explain the phenomena of propagation of sound wave through compressions and rarefactions with the help of a suitable diagram.
[5 MARKS]

Q. The waves that required a material medium for their propagation are called

1. Matter waves
2. Electromagnetic waves
3. Carrier waves
4. Mechanical waves

Q. Distance travelled by a wave in one second is called:

1. Wave velocity
2. Frequency
3. Amplitude
4. None of the above

Q.

Why can a transverse wave not be produced in gas?

Q.

What is one important function of deflecting systems?

Q.

How are compressions and rarefactions produced in air near a source of sound? [3 MARKS]

Q.

A particle on the trough of a wave at any instant will come to the mean position after a time.

1. $T$

2. $2T$

3. $\frac{T}{2}$

4. $\frac{T}{4}$

Q. Compression is the region of in a sound wave.

1. low pressure
2. low density
3. high pressure

Q.

State true or false.
Compression is the region of low pressure.

1. True

2. False

Q.

The disturbance created by a source producing sound in a medium travels through:

1. the medium
2. the particles of the medium
3. depends on the medium
4. both A and B

Q. Discuss the effect of temperature on the velocity of sound in gases. State Newton second Law of Motion. On its basis derive the relation between force and acceleration

Q.

Three statements regarding the propagation of sound waves.

I Sound waves propagate through a series of crests and troughs.

II Sound waves require a material medium for their propagation.

III The propagation of sound waves is attributed to the motion of particles.

Among the given statements,

1. only III is incorrect

2. both I and II are incorrect

3. both II and III are incorrect

4. only I is incorrect

Q. The distance between consecutive crests or troughs is known as _____ of a wave.

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

Q.

What do you understand by,

1. Shock waves
2. Sonic boom

Q.

A pebble is dropped into a well of depth h . The splash is here after time t .if c is the velocity of sound. Then what will be t

Q. In transverse waves, the particle motion is ________to the wave propagation.

1. opposite
2. parallel
3. diagonal
4. right-angled

Q.

A stone is dropped in a well of depth$19.6m$. After how many seconds the sound of splash will be heard to the observer.velocity of sound in $\mathrm{air}=340{\mathrm{ms}}^{-1}$

Q. The density-distance graph of a sound wave is given below. Choose the correct displacement-distance graph among the following.

1. 
2. 
3. 
4. 

Q.

Propagation of sound can be visualised as:

1. propagation of density variations

2. propagation of pressure variations

3. a series of compressions and rarefactions

4. all of the above

Q. is an example of transverse wave.

1. Light
2. Sound
3. Ultrasonic

Q.

Name the device which is used to produce sound in laboratory experiments.

Q. Describe the motion of a charged particle in a cyclotron if the frequency of the radio frequency (rf) field were doubled.

Q.

Which of the following can produce longitudinal waves as well as transverse waves under different conditions ?

(a) water

(b) TV transmitter

(c) slinky

(d) tuning fork

Q.

Sound requires a medium (solid, liquid or gas) for its propagation

1. True
2. False

Q.

Which of the following factors does the speed of sound in a medium depend upon?

1. Elasticity of the medium

2. Density of the medium

3. Electrical resistance of the medium

4. Thermal conductivity of the medium