Introduction to Waves

Q.

Amongst solids, liquids, and gases, the speed of sound is the least in __________.

Q.

Describe with the help of a diagram, how compressions and rarefactions are produced in the air near a source of the sound.

Q.

Wavelength is measured in Hertz.

1. True
2. False

Q.

Which of the following statements are correct regarding waves?

1. Waves are disturbances that can propagate through a medium.

2. Depending on nature of oscillation, waves can be longitudinal or transverse.

3. Waves transfer energy from one place to another.

4. Waves transfer matter from one place to another.

Q. What is mean by RADIATION?

Q.

Why does the speed of sound differ in different media? Arrange the speed of sound in solids, liquids, and gases in the increasing order.

Q. Describe an experiment to show that sound can travel in a solid.

Q. A sound wave propagating in air may be treated either as a displacement wave or a pressure wave.What is the phase difference between the displacement and pressure wave :

1. ${180}^{\circ }$
2. ${90}^{\circ }$
3. ${45}^{\circ }$
4. zero

Q. Place a ringing bell in a closed jar and then remove air completely from the jar through a vacuum pump, as shown below in figure (a). Can we hear the ringing sound when the switch is turned on? Give reason for your answer.

Fig. (a)

Q.

Information can be passed through particles moving about its fixed positions, and influencing the adjacent particles to do the same.

1. True

2. False

Q. State whether given statement is True or False
A wave is a disturbance that moves through a medium when the particles of the medium set neighboring particles into motion.

1. True
2. False

Q. Place a ringing bell in a closed jar and then remove air completely from the jar through a vacuum pump, as shown below in figure (a). Can we hear the ringing sound when the switch is turned on? Give reason for your answer.

Fig. (a)

Q.

how sound produce?

Q.

Information can be transmitted by a particle when:

1. The particle moves from one place to another.

2. The particle vibrating about its fixed position disturbs the particle next to it and so on.

3. The particle remains at rest.

4. The particle vibrating about its fixed position does not interact with the particle next to it.

Q. Describe an experiment to show that sound can travel in a solid.

Q. Sound cannot travel through:

1. Air
2. Vacuum
3. Water
4. Iron

Q.

Why waves are always curved or spherical?

Q. Displacement (y) of air column at position x from its mean position at any instant is given by graph shown in figure. Then :

1. Density of air is maximum at B
2. Density of air is minimum at D
3. Density is maximum at D
4. Density is minimum at A

Q. Which of the following statement(s) depict the characteristics of mechanical waves?

1. Propagate as oscillation of particles of matter
2. Transport matter only
3. Do not need a medium to travel
4. Transport both energy and matter