P13 - Electromagnetic Waves (PAPER 2) Flashcards

1
Q

what is 1 nanometre in terms of mm and what is the unit

A

1 nm = 0.000 001mm

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

What is 1 picometre in terms of nm and what is the unit

A

1 pm = 0.001nm

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

What are the 6 types of rays on the electromagnetic spectrum in order of increasing frequency

A
  • radio waves
  • microwaves
  • infrared radiation
  • visible light
  • UV waves
  • X rays and gamma rays
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the wavelength of visible light

A

between 400nm to 700nm

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

how is energy transferred via electromagnetic waves

A

electromagnetic waves transfer energy from a source to an absorber

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

what is the formula used to calculate wave speed

A

wave speed (m/s) = frequency (Hz) x wavelength (m)

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

What is white light

A

light that contains all colours of visible spectrum

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

What type of radiation is mobile phone radiation

A

microwave radiation - radio waves at near microwave frequencies

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

why are microwaves and radio waves hazardous

A

they can cause the internal parts of bodies to heat up

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

Why is infrared radiation dangerous

A

it can cause skin burns

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

what does having radio waves of different frequencies change (3)

A
  • how far they can travel
  • how much they can spread
  • how much information they are able to carry
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

what waves are used for satellite TV

A

Microwaves

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

What is the difference between difference between UV and visible light

A

UV light has a shorter wavelength, UV light can harm the skin and eyes

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

What are X-rays and gamma rays used for

A

X-ray - making X-ray images
Gamma ray - sterilisation, killing cancer cells, kill bacteria

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

What is ionising radiation

A

radiation that makes uncharged atoms charged

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

What can X-rays be used for at hospitals (2)

A
  • to make images of internal body parts
  • to destroy tumours at or near body surface
17
Q

What in the body absorbs X-rays the best

A

It is absorbed more by bones and teeth than soft tissues

18
Q

What damages do X-rays and gamma rays cause

A

Kill all living tissue it passes through - ionising radiation

19
Q

What are carrier waves

A

waves that carry information by varying their amplitude

20
Q

What are optical fibres

A

thin transparent fibres that are used to transmit communication signals by light and infrared radiation