Modelling With Waves

Question 1

A wave is….

Answer 1

A model for any disturbance that propagates through a medium, transferring energy without the transfer of matter

Question 2

Amplitude

Answer 2

The maximum displacement of the medium, measured from the equilibrium

Question 3

Wavelength

Answer 3

Length between any two closest points of the wave that are in the same phase

Question 4

Period

Answer 4

Time for one wave to complete

Question 5

Frequency

Answer 5

The number of waves produced in a second

Question 6

Wave velocity

Answer 6

Distance travelled by a wave in a second

Question 7

Longitudinal wave examples….

Answer 7

Sound waves, and earthquake and explosion waves, also known as seismic P waves

Question 8

In a longitudinal wave….

Answer 8

The displacement or the medium is parallel to the propagation of the wave

Question 9

Transverse waves example

Answer 9

All types of electromagnetic radiation including visible light

Question 10

Refraction

Answer 10

The change of direction and a wavelength of a wave when it enters a medium where it changes speed

Question 11

Refraction takes place….

Answer 11

In all waves: sound, water, light, earthquake waves etc

Question 12

In cold air

Answer 12

Sound waves travel slower

Question 13

In warm air

Answer 13

Sound waves travel faster

Question 14

Difference of longitudinal and transverse waves

Answer 14

Transverse waves travel well in solids but not fluids, longitudinal travel through all states of Mayer because their medium particle move parallel to the direction of the wave

Question 15

What is total internal reflection?

Answer 15

TIR describes light hitting and reflecting off the surface of an object, without transmitting through the surface

Question 16

When will total internal reflection take place?

Answer 16

It will only take place when: a light Ray is in a more dense medium which is approaching a less dense one. Any angle of incidence for a light Ray which is larger than the critical angle, will create total internal reflection

Question 17

What is the critical angle?

Answer 17

The critical angle is a certain angle that justifies whether something is refraction or total internal reflection, for glass the critical angle is approx. 42°

Question 18

TIR in optical fibres

Answer 18

Light goes in at one end and undergoes repeated TIR and emerges at the other end

Question 19

Crest

Answer 19

The high part of a wave

Question 20

Troughs

Answer 20

The low parts of a wave

Question 21

How are sound waves diffracted

Answer 21

Though doorways because the wavelengths of sounds are about the same size as doorways, which is why we can hear people without seeing them

Question 22

How are light waves diffracted

Answer 22

Light can only be diffracted if it passes though a narrow slit, this shows how light is a wave motion with a small wavelength

Question 23

Waves can be

Answer 23

Diffracted through a narrow opening

Question 24

Transverse waves can be

Answer 24

Water or light waves

Question 25

Longitudinal waves can be

Answer 25

Sound waves

Question 26

In longitudinal waves

Answer 26

The vibration is along the direction of the waves

Question 27

The shorter the wavelength

Answer 27

The higher the frequency

Question 28

In transverse waves

Answer 28

The vibration is at right angles to the direction of the wave

Question 29

Radio and TV wave diffraction

Answer 29

Affects people living on hills. A radio wave can diffract around the hill, a to wave with a short wavelength doesn't bend as much

Question 30

Waves that reflect

Answer 30

Sound and light waves

Question 31

The angle of incidence equals

Answer 31

The angle of reflection

Question 32

Refraction is

Answer 32

When a wave changes speed by passing a boundary between 2 substances with different densities. This causes them to change direction

Question 33

Refraction doesn't happen

Answer 33

If it crosses the boundary at an angle of 90°, it just continues as a straight line

Question 34

Reflection acts

Answer 34

Like a mirror

Question 35

Sound waves are

Answer 35

Longitudinal waves that must pass through a medium

Question 36

Light and electromagnetic radiation

Answer 36

Travels as transverse waves

Question 37

The greater the amplitude of a sound wave

Answer 37

The louder the sound

Question 38

The greater the frequency of a sound wave

Answer 38

The higher the pitch

Question 39

If sound waves have the same frequency

Answer 39

They will have the same pitch

Question 40

If sound waves have the same amplitude

Answer 40

They will have the same loudness

Question 41

The normal range of human hearing

Answer 41

Between 20 Hz to 20,000 Hz (20 kHz)

Question 42

The direction of vibration in light waves

Answer 42

Is at 90° to the direction that the light travels

Question 43

Light travels in

Answer 43

Straight lines

Question 44

Light waves travel though a

Answer 44

Vacuum,cleaning they do not need a substance to travel through rather transparent and translucent substances

Question 45

The law of reflection

Answer 45

When light reaches a mirror, it reflects off the surface of the mirror

Question 46

Rays in light reflection

Answer 46

The incident day goes toward the mirror, the reflected Ray goes away from it

Question 47

Oscillation

Answer 47

A motion that repeats itself in a regular cycle

Question 48

Medium

Answer 48

Substance or material that carries the wave

Question 49

Pulse

Answer 49

A single disturbance moving through a medium from one place to another

Question 50

Propagation

Answer 50

Any ways in which waves travel. Eg for electromagnetic waves, propagation may occur in a vacuum

Question 51

Longitudinal wave

Answer 51

A wave vibrating in the direction of propagation

Question 52

Transverse waves

Answer 52

A wave in which the medium vibrates at right angle to the direction of its propagation

Question 53

What is interference?

Answer 53

When two waves meet while travelling along the same medium

Question 54

Brightness of light with amplitude:

Answer 54

The higher the amplitude, the brighter the star

Question 55

Wavelength tells you

Answer 55

The type of light

Question 56

Amplitude tells you

Answer 56

The intensity of the light