P11

Question 1

How to tell if it is a transverse wave

Answer 1

The oscillations (vibrations) are perpendicular to the direction of energy transfer. The vibrations go up and down

Question 2

How to tell if it is a longitudinal wave

Answer 2

The oscillations are parrellel to the direction of energy transfer. Straight line, some parts compressions and some rarefractions

Question 3

What is the amplitude of a wave

Answer 3

Maximum displacement of a point on the wave from its undisturbed position

Question 4

What is the wavelength

Answer 4

Distance between same point on 2 adjacent waves

Question 5

What is the frequency

Answer 5

Number of complete waves passing a certain point per second

Question 6

Example of transverse waves

Answer 6

Light, radio, microwaves, infared, radation, visible light, ultraviolet, x rays, gamma rays
(EM SPECTRUM)

Question 7

Example of longitudinal wave

Answer 7

Sound, ultrasound, infrasound, earth quakes

Question 8

What 3 things happen when a wave meets a boundary between 2 materials

Answer 8

• the wave is absorbed by the second material
• the wave is transmitted through the second material
• the wave is reflected

Question 9

What is refraction

Answer 9

Waves changing direction at a boundary

Question 10

How do we know if a wave has been refracted

Answer 10

If the wave hits the boundary at an angle and it changes directik

Question 11

How do we know how much it is refracted

Answer 11

Depends on how much the wave speeds up or slows down

Question 12

What does the speed of the wave depend on

Answer 12

The density of the material - the higher the density of the material, the slower the wave travels through it

Question 13

What is the optical density of a material

Answer 13

Optical denisty of a material measures how quickly light can travel through it

Question 14

What stays the same and what changes when a wave is refractsd

Answer 14

The frequency stays the same byt the wavelength changes

Question 15

Amplitude

Answer 15

Height of a wave crest or trough wave from the rest position

Question 16

Electromagnetic waves

Answer 16

Electric and magnetic dusturbances that transfer enrrgy from 1 place to another

Question 17

Oscillate

Answer 17

Move to and fro about a certain position along a line (transverse waves)

Question 18

Reflection

Answer 18

Change of direction of a wave at a boundary when the wave stays in the incident medium

Question 19

Go to page 219 for the practical

Answer 19

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Question 20

What are the two uses of waves?

Answer 20

Energy and information

Question 21

What do mechanical waves need?

Answer 21

A medium to travel through

Question 22

How to demonstrate a longitudinal wave?

Answer 22

Slinky to demonstrate sound waves

Question 23

Period of a wave:

Answer 23

1/frequency

Question 24

Reflection test

Answer 24

Plane waves in a ripple tank are reflected from a straight barrier at the same angle to the barrier as the incident waves becuase their speed and wavelength dont change the reflection

Question 25

Plane waves crossing a boundry:

Answer 25

They are refracted unless they cross the boundary at a normal incidence