Brainscape's Knowledge GenomeTM

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


See full index

Physics (P.1) > Electromagnetic Waves > Flashcards

Electromagnetic Waves Flashcards

You may prefer our related Brainscape-certified flashcards:
Physics 101 flashcards AP® Physics flashcards
0
Q

Where does refraction take place?

A

At the bounties between layers of air at different temperatures

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

What is defraction?

A

The spreading out of waves when they pass through a gap or around an object

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

What are electromagnetic waves?

A

They are electric and magnetic waves disturbances that transforms energy from one place to another

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

What are the hazards/problems with using UV light?

A

Sun burns

Skin cancer

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

Why at night can you hear sound a long way away from its source?

A

Because sound waves refract back on the ground

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

What problems do infra-red course to cells?

A

Skin burns

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

What problems do micro and radio waves cause to cells?

A

Internal heating

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

Why can light not be diffracted around a corner?

A

Because the wavelengths are to small

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

How can we use information transferred?

A

By waves in communication

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

Give examples of electromagnetic waves?

A

Light waves
Radio waves
Microwaves

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

What is the change in direction due to (in refraction)?

A

A change of speed

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

What type of wave are electromagnetic waves?

A

Transverse waves

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

What is refraction?

A

The change in direction of waves when they travel across a boundary

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

Why is violet refracted the most ?

A

It has a shorter wavelength

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

What are gamma rays used for?

A
  • to kill censer cells
  • sterilise food so it doesn’t go of so quickly
  • to check if two metals have fitted together
  • to see inside your body
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Give examples of mechanical waves

A

Sound waves
Water waves
Waves on spring and ropes
Seismic waves (produced by earthquakes)

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

How is UV light made?

A

Sun
Hot objects in space
Hot lights

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

What can infra-red be used for ?

A

Remote handsets
In optical fibers
Infra-red cameras
Infra-red scanned

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

What problems do UV, X-Ray and gamma rays cause to cell?

A

More servers cell damage

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

What are pixels?

A

Thousands of tiny light sensitive cells

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

When does the loudness of a note increase?

A

The amplitude of the sound waves increases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What can we use waves for?

A
  • to transfer information

- to transfer energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What is the wavelength?

A

The distance from one crest top to another

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What are optical fibers?

A

They are very thin transparent fibers

They are used to transmit signals by light and infra-red radiation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What does white light contain?

A

All colours of the visible spectrum

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

What is the amplitude?

A

The height of the wave crest from the position of the rest

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

What are microwaves used for and why?

A

Satellite phone and tv links

They can pass through the atmosphere

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

Are mechanical waves transverse or longitudinal and give an example?

A

Both

Slinky spring

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

What are optical fivers used for?

A

Medical uses

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

Give three facts an image in a plane (flat) mirror

A

It is up right
Vertual
The same size as the object

30
Q

What is the frequency if a humans hearing range?

A

20-20 000 Hz

31
Q

Give all the electromagnetic spectrums from longest wavelength to shortest

A 
Radio
Micro
Infrared 
Visible 
UV
X-Ray 
Gamma
32
Q

What does sound travel fastest through and why?

A

Solids because the particles are closer together

33
Q

What are the hazards/problems with using light?

A

Bright light can cause discomfort

34
Q

What do mechanical waves need to travel through?

A

A medium

35
Q

What happens to the air when sound waves pass through it?

A

It makes the air around it vibrate as it pushes and pulls it

36
Q

What is the frequency and what is it measured in?

A

The number of wave crests paras song through a point in one second

Hertz

37
Q

Why do radio waves have poor reception when they go over hills?

A

Because they won’t have diffracted enough

38
Q

Can sound diffract around an open door way?

A

Yes

39
Q

When does the pitch note increase?

A

When the frequency of the found waves increase

40
Q

What can electromagnetic waves do?

A

They can travel through a vacuum at the same speed of light (300000 kilometres per second) no medium is needed

41
Q

What is the visible light used for?

A

Vision

Photography

42
Q

What is the normal?

A

It is a construction line perpendicular to the reflecting surface at the point of incidence

43
Q

Are mobile phones safe to use?

A

More research needs to be done to evaluate it

44
Q

What are radio waves with more than 100m used for?

A

National and international radio stations

45
Q

What are the hazards/problems with using radio waves?

A

It can course: cancer, effect health, cell damage, brain damage

46
Q

What are the hazards/problems with using gamma ray?

A

Hard to control so you could kill other cells without meaning to
If exposed to it cells can mutate and cause cancer
It has a short wavelength so it is very dangerouse

47
Q

What are x-rays used for?

A

To see bones in hospitals

48
Q

What are mechanical waves?

A

They are vibrations that travel through the medium (substance)

49
Q

What is the wave equation?

A

Speed (m/s)=frequency (Hz) + wavelength (m)

50
Q

How are microwaves made?

A

Many types if transmitters

51
Q

How are gamma rays made?

A

Some radioactive substances

Given of by stars

52
Q

What is the hazard with using infrared?

A

Over heating

53
Q

The warmer it is the …………. the spread of sound

A

Greater

54
Q

What are echoes due to?

A

Sounds reflected of smooth hard surfaces

55
Q

What is the difference between a real image and a virtual image?

A

A real image can be projected onto a screen but a virtual image can only exist in a mirror

56
Q

For a light ray reflected by a plain mirror what two angles are there?

A

Angle of reflection

Angle of incidence

57
Q

Why are radio waves with different wave lengths used for different purpose ?

A

Because the wavelength affects how far they go, how much they spread and how much information they carry

58
Q

What are hazards with using X-rays?

A

They cause cancer if over exposed

59
Q

What are UV lights used for?

A 
Sun beds
Lights
Bugs are attracted to the light 
Fake notes 
They can glow in the dark so they are used in discos
60
Q

How is light/visible made?

A

It is emitted by luminous objects

61
Q

What are radio waves with a less than 1m wavelength used for?

A

TV broadcasting

62
Q

What can we replace with radio waves?

A

Bluetooth

63
Q

How are x-rays made?

A

X-ray machines

64
Q

When light passes from air into glass is the angle of refraction (inside the glass) more or less than the angle of incidence?

A

Less

65
Q

Why can’t light diffract around an open door?

A

Because the gap must be a similar size to the wavelength of the wave in order for diff reaction to take place

66
Q

The greater the diffraction, the …………. the gap

A

Narrower

67
Q

What are the hazard with using microwaves?

A

May stop working

Long exploiter can lead to brain damage

68
Q

How are radio waves made?

A

Many transmitters
Lights
Stars
Sparks

69
Q

What happens to sound during the day time any why?

A

Sound refracts upwards

Because the air near the ground is warmer than the air higher up

70
Q

What are radio waves used for?

A

Radio and tv broadcasting
Radio communication
Mobil phone calls

71
Q

What do microwaves carried ?

A

Mobile phone calls

72
Q

What do we mean when we say that instruments resonates?

A

Vibration created by a musical instrument produces sound waves

Physics (P.1) (9 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions