Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Year 8 Science > Light and Sound > Flashcards

Light and Sound Flashcards

You may prefer our related Brainscape-certified flashcards:
Biology 101 flashcards
1
Q

A wave transfers_______. It does not transfer_________.

A

Energy, matter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

In a _______ wave the vibration of the particles is perpendicular to the direction of energy transfer

A

Transverse

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

In a ______ wave the vibrations of the particles are parallel to the direction of the energy transfer

A

Longitudinal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Transverse wave- the____ of the particles is_______ to the direction of energy transfer

A

Vibration/oscillation, perpendicular

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Longitudinal wave- the________of the particles is_______ to the direction of energy transfer

A

Vibration/oscillation, parallel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

In a longitudinal wave, areas where the particles are pushed together are called___________

A

Compressions, rarefactions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

A louder sound will have a higher_________

A

Amplitude

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

A high pitch sound will have a higher______

A

Frequency

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Give an example of a longitude wave

A

Sound

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Give an example of a transverse wave

A

light (also radio, microwaves, infra-red, UV, X-ray, gamma ray, water waves)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

An object which gives off light is known as….

A

luminous

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

How can we see non-luminous objects?

A

because light is reflected off the object

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

When light hits and object and “stops” it is known as…

A

absobtion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

When light hits and object and bounces off it is known as…

A

reflection

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

A material that lets light through without scattering is known as…

A

transparent

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is an opaque material?

A

A material that does not let light pass through

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

An object that scatters light as it passes through is known as…

A

transluscent

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

How does the angle of incidence compare to the angle of reflection?

A

they are equal/the same

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

“If we are drawing a reflected ray, which step is missing
1. Extend the incident line to the surface.
2.
3. Measure angle of incidence.
4. Construct your angle of reflection.”

A

Draw on the normal line

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What is refraction?

A

The change in direction of a wave when it changes speed.

21
Q

When does refraction occur?

A

When a wave moves into a different substance

22
Q

If the speed of a wave decreases as it moves into a new substance it will bend _____________ the normal

A

towards

23
Q

If the speed of a wave increases as it moves into a new substance it will bend _____________ the normal

A

away from

24
Q

If the speed of a wave increases as it moves into a new substance it will bend _____________ the normal

A

away from

25
Q

When the angle of incidence is greater than the critical angle, what will happen to the light?

A

All the light will be reflected/total internal reflection.

26
Q

If all the light is reflected with a material (e.g. a piece of glass), what is this known as?

A

Total internal reflection

27
Q

Give two examples of where total internal reflection is found in real-life applications

A

Periscopes (submarines), internal cameras (medicine), fibre-optic communications e.g. fast broadband, inspecting aircraft engines

28
Q

What is the name of the coloured circle around the pupil. It controls the size of the pupil

A

Iris

29
Q

What is the purpose of the lens in the eye?

A

To focus light onto the retina

30
Q

What is the purpose of the lens in the eye?

A

To focus light onto the retina

31
Q

What do you call the black part of the eye? It is the opening that lets light in

A

Pupil

32
Q

What is the retina?

A

Light-sensitive layer at the back of the eye, made up of rods and cones

33
Q

What is the purpose of the optic nerve?

A

Carries messages from the retina to the brain.

34
Q

Why do we end up with an inverted image formed on our retina when we look at an object?

A

Because light is refracted by the cornea and lens in our eye.

35
Q

What three colours of light can our eyes detect?

A

red, green, blue

36
Q

What are the colours of the spectrum that make up white light?

A

Red, Orange, Yellow, Green, Blue, Indigo, Violet (use ROY G. BIV or Richard Of York Gave Battle In Vain to help you remember the order)

37
Q

The colour of a light depends on what feature of a wave?

A

Frequency

38
Q

When light enters a prism it splits into the colours of the spectrum, what do we call this effect?

A

Dispersion

39
Q

Why does a blue object appear blue when a white light is shone upon it?

A

It reflects blue light. It absorbs all other colours of light.

40
Q

Why do black objects appear black?

A

They absorb all colours that are shone on them. No light is reflected.

41
Q

When red and green light is combined, what colour is formed?

A

Yellow

42
Q

When red and blue light is combined, what colour is formed?

A

Magenta

43
Q

When blue and green light is combined, what colour is formed?

A

Cyan

44
Q

If a sound is becoming lower in volume, what is decreasing?

A

The amplitude

45
Q

What formula can we use to calculate the speed of sound?

A

speed = distance/time

46
Q

Do sound waves travel fastest in solid, liquid or gas?

A

Solid

47
Q

Do light waves travel fastest through a solid, liquid or gas?

A

Gas (light travels fastest through a vacuum)

48
Q

When calculating the speed of sound using an echo, what must you remember

A

The echo travels to an object and back again (you may need to double the distance or halve the time provided - take care!)

Year 8 Science (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions