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Science semester 1 > EMR(Electro-Magnetic Radiation) > Flashcards

EMR(Electro-Magnetic Radiation) Flashcards

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1
Q

What are the three types of EMR that are ionising?

A

X-rays
Ultra violet radiation
Gammar Rays

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2
Q

What are the five types of non-ionising EMR waves?

A 
Visible Light
Infra red  radiation 
Microwaves
Radio Waves
Low frequency waves
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3
Q

Define radiation

A

Radiation is a particle or wave that travels through space

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4
Q

Radio waves have a wavelength of?

A

2km-1m

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5
Q

Microwaves have a wavelength of?

A

1m-1mm

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6
Q

Infra red has a wavelength of?

A

1mm-750nm

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7
Q

Visable light has a wavelength of?

A

750nm-480nm

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8
Q

Ultra violet has a wavelength of?

A

480nm-100nm

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9
Q

X-rays have a wavelength of?

A

100nm-10nm

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10
Q

Gammar rays have a wavelength of?

A

10nm-10pm

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11
Q

What is the speed of light?

A

3x10*m/s

*=8

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12
Q

What colours do white object reflect?

A

All colours

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13
Q

What colours does black reflect?

A

None

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14
Q

What colour is reflected off coloured items?

A

The colour which they appear

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15
Q

What can happen to light when it hits an object?

A

It can be absorbed, reflected or transmitted

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16
Q

What does something that transmits all light look like?

A

Clear

17
Q

How to filters work? Colour addition or colour subtraction?

A

Colour subtraction

18
Q

When mixing light we are using?

A

Colour addition

19
Q

Radio waves are used in?

A

Communication

20
Q

Microwaves are used in

A

Mobile phones

Microwave ovens

21
Q

Infra red are used in

A

Healing sports injuries
Tv remote controls
Night vision goggles

22
Q

What is visible light used in

A

Light bulbs
DVD players
Laser printers

23
Q

Ultra violet is used in

A

Sterilising food
Killing microbes
Skin tanning

24
Q

X-rays are used in

A

Airport security
Astronomy
See inside people

25
Q

Gammar rays are used in

A

Cancer treatment

Radio therapy

26
Q

What is the formula for speed of a wave?

A

Speed=frequency x wavelength

27
Q

What does AM stand for

A

Amplitude modulation

28
Q

How dies AM work?

A

AM changes the amplitude of the carrier wave

29
Q

What does FM stand for

A

Frequency modulation

30
Q

How does FM work?

A

FM change the frequency of the carrier wave

31
Q

Which travels further AM or FM?

A

AM

32
Q

What do ADSL modems use to send information?

A

Digital signal

33
Q

What do optic fibre modems use to send a signal?

A

Light pulses along glass fibres

34
Q

What EMR do TVs use?

A

Radio waves

35
Q

Do TVs have a digital or analogue signal?

A

Digital

36
Q

What type of EMR do mibile phones use?

A

Microwaves

37
Q

Explain how a message gets from one mobile phone to another

A

Mobile phone sends a message to a base station which is in line of sight of the sender. The message is then moved between the base station to another using a copper cable, optic fibre or satellites. It is then distributed to the receiving phone.

38
Q

Can all EMR be reflected, bent or make a shadow?

A

Yes

Science semester 1 (2 decks)

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