Waves

Question 1

What are waves caused by

Answer 1

Oscillations

Question 2

What do waves transfer from one place to another

Answer 2

Energy

Question 3

What are the two types of waves called

Answer 3

Transverse and longitudinal

Question 4

What is one feature of of a longitudinal wave

Answer 4

The direction of vibration is parallel to the direction in which the wave travels

Question 5

Does a longitudinal wave have compressions

Answer 5

Yes and rarefractions

Question 6

Name two types of longitudinal waves

Answer 6

Sound
P-Waves

Question 7

Name one feature of a transverse wave

Answer 7

The direction of vibration of the particles is perpendicular to the direction in which the wave travels

Question 8

Name two transverse waves

Answer 8

EM waves
S-Waves

Question 9

Whats the displacement of a vibrating particle

Answer 9

Its distance and direction from its equilibrium position

Question 10

What is the amplitude of a wave

Answer 10

Maximum displacement of a vibrating particle

Question 11

What is the wavelength of a wave

Answer 11

Least distance between two adjacent particles with the same displacement and velocity at the same time

Question 12

What is a cycle in terms of waves

Answer 12

Maximum displacement to the next maximum displacement

Question 13

What is the period of a wave

Answer 13

The time for one complete wave to pass a fixed point

Question 14

What is the frequency of a wave

Answer 14

Number of cycles per second

Question 15

What does an unpolarised transverse wave have

Answer 15

Oscillations in many planes

Question 16

What does a polarised transverse wave have

Answer 16

Oscillations in one plane

Question 17

What is one use of polarised lenses

Answer 17

Sunglasses

Question 18

What happens when light is reflected

Answer 18

It becomes horizontally polarised causing glare

Question 19

What can happen when we use a Polaroid

Answer 19

Block out glare

Question 20

Why cant longitudinal waves be polarised

Answer 20

The vibrations occur in the same direction as the wave travels

Question 21

How do you convert radians to degrees

Answer 21

Angle/180 x pi

Question 22

360 degrees in radians

Answer 22

2 pi

Question 23

270 degrees in radians

Answer 23

1.5 pi

Question 24

270 degrees in radians

Answer 24

1.5 pi

Question 25

180 degrees in radians

Answer 25

Pi

Question 26

90 degrees in radians

Answer 26

0.5 pi

Question 27

0 degrees in radians

Answer 27

1 pi

Question 28

What does phase difference tells us

Answer 28

How the different points on a wave are moving relative to each other

Question 29

How can we show waves

Answer 29

As wavefronts

Question 30

What is the law of reflection

Answer 30

Angle of incidence = angle of reflection

Question 31

What changes when waves travel from medium to another

Answer 31

Speed and direction

Question 32

What remains constant when waves travel from one medium to another

Answer 32

Frequency

Question 33

When entering another medium what 3 things can happen

Answer 33

Reflection Transmission Absorption

Question 34

What happens to the speed when a wave travels into a more dense medium

Answer 34

It slows down

Question 35

What happens to the wavelength when a wave travels into a more dense medium

Answer 35

It decreases

Question 36

What is diffraction

Answer 36

The so-reading out of waves as they pass the rough a gap or near an object

Question 37

What is the resolution of a telescope

Answer 37

The measure of the smallest point of a telescope can successfully image

Question 38

What can happen in low resolution images

Answer 38

Parts of the image may blur together. Two separate images may appear as one

Question 39

Do longer waves diffract more

Answer 39

Yes

Question 40

What happens when waves meet at point

Answer 40

They temporarily combine

Question 41

What’s the name when a waves amplitude increases when they combine

Answer 41

Rise to interference

Question 42

What is an example of two waves meeting in phase

Answer 42

Crest meets crest

Question 43

What type of interference is produced when they meet in phase

Answer 43

Constructive producing larger amplitude waves

Question 44

What type of interference occurs when two waves meeting out of phase

Answer 44

Destructive giving low or no amplitudes waves

Question 45

What’s the difference between exactly out of phase and out of phase

Answer 45

Pi(dotted lines showing the waves next move)

Question 46

What is an interference pattern

Answer 46

Combination of constructive and destructive interferences. Forms a repeated pattern of maxima and minima

Question 47

Why does coherence matter

Answer 47

Required for a stable interference pattern (light waves from coherent sauces have the same frequency and phase difference which remains constant overtime)

Question 48

Do coherent waves have the same wavelength

Answer 48

Yes

Question 49

How are stationary waves formed

Answer 49

Two waves travelling in opposite directions with the same frequency,speed and amplitude which results in points of zero displacement and maximum displacement

Question 50

What’s another word for zero displacement

Answer 50

Nodes

Question 51

What’s another word for maximum displacement

Answer 51

Antinodes

Question 52

What does in-phase oscillations mean

Answer 52

Every part of the wave vibrates in phase with every other part between nodes

Question 53

What is the simplest type of stationary wave known as

Answer 53

The first harmonic

Question 54

Do nodes every vibrate

Answer 54

No