Chapter 3: Waves (Pt.1)

Question 1

How does a wave transfer energy?

Answer 1

From one place to another without transferring matter in the process

Question 2

What is disturbance.

Answer 2

The up and down movement of wave.

Question 3

Tell me about vibrations in ropes.

Answer 3

Particles vibrate in fixed positions.
Energy in particles travels from one place to another by a single travelling pulse
The direction in which the wave travels is perpendicular to the direction of disturbance.

Question 4

Tell me about vibrations in springs

Answer 4

The wave travels in the same direction as the disturbance.
The vibrations push and pull nearby molecules, causing them to move forward and backward

Question 5

Explain the features of a wave using a diagram.

Answer 5

Question 6

How do you calculate wave speed?

Answer 6

Question 7

Answer 7

Question 8

What are transverse waves?

Answer 8

Waves where the medium vibrates perpendicular to the direction of its motion.

Question 9

Give examples of transverse waves.

Answer 9

Electromagnetic waves
Waves on a rope
Water waves
Seismic S waves

Question 10

What are longitudinal waves?

Answer 10

Waves which are vibrating in the direction of motion

Question 11

Give examples of longitudinal waves.

Answer 11

Sound waves
Waves on a spring
Seismic P waves

Question 12

Draw a reflected wave.

Answer 12

Question 13

What is the law of reflection?

Answer 13

Angle of incidence = angle of reflection

Question 15

What does refraction involve?

Answer 15

A change in the direction of waves as they pass from one medium to another

Question 16

How do waves refract?

Answer 16

If the wave enters a more optically dense medium, its speed decreases and it bends towards the normal.

If the wave enters a less optically dense medium, its speed increases and it bends away from the normal

In all cases, the frequency stays the same but the wavelength changes.

Question 17

What affects the speed of waves travelling in water?

Answer 17

The depth of the water

Water waves travel fastes when the medium is the deepest.

If water waves are passing from deep water into shallow water, they will slow down.

Question 18

What happens when the water waves decrease in speed?

Answer 18

There will also be a decrease in wavelength, which causes a change in direction.

Question 19

What is diffraction?

Answer 19

A change in direction of waves as they pass through an opening or around a barrier in their path

Question 20

What happens if the gap is narrow?

Answer 20

The narrower the gap, the greater the wavelength, the more the diffraction.

Question 21

Draw diffracted waves.

Answer 21