EMR(Electro-Magnetic Radiation)

Question 1

What are the three types of EMR that are ionising?

Answer 1

X-rays
Ultra violet radiation
Gammar Rays

Question 2

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

Answer 2

Visible Light
Infra red  radiation 
Microwaves
Radio Waves
Low frequency waves

Question 3

Define radiation

Answer 3

Radiation is a particle or wave that travels through space

Question 4

Radio waves have a wavelength of?

Answer 4

2km-1m

Question 5

Microwaves have a wavelength of?

Answer 5

1m-1mm

Question 6

Infra red has a wavelength of?

Answer 6

1mm-750nm

Question 7

Visable light has a wavelength of?

Answer 7

750nm-480nm

Question 8

Ultra violet has a wavelength of?

Answer 8

480nm-100nm

Question 9

X-rays have a wavelength of?

Answer 9

100nm-10nm

Question 10

Gammar rays have a wavelength of?

Answer 10

10nm-10pm

Question 11

What is the speed of light?

Answer 11

3x10*m/s

*=8

Question 12

What colours do white object reflect?

Answer 12

All colours

Question 13

What colours does black reflect?

Answer 13

None

Question 14

What colour is reflected off coloured items?

Answer 14

The colour which they appear

Question 15

What can happen to light when it hits an object?

Answer 15

It can be absorbed, reflected or transmitted

Question 16

What does something that transmits all light look like?

Answer 16

Clear

Question 17

How to filters work? Colour addition or colour subtraction?

Answer 17

Colour subtraction

Question 18

When mixing light we are using?

Answer 18

Colour addition

Question 19

Radio waves are used in?

Answer 19

Communication

Question 20

Microwaves are used in

Answer 20

Mobile phones

Microwave ovens

Question 21

Infra red are used in

Answer 21

Healing sports injuries
Tv remote controls
Night vision goggles

Question 22

What is visible light used in

Answer 22

Light bulbs
DVD players
Laser printers

Question 23

Ultra violet is used in

Answer 23

Sterilising food
Killing microbes
Skin tanning

Question 24

X-rays are used in

Answer 24

Airport security
Astronomy
See inside people

Question 25

Gammar rays are used in

Answer 25

Cancer treatment | Radio therapy

Question 26

What is the formula for speed of a wave?

Answer 26

Speed=frequency x wavelength

Question 27

What does AM stand for

Answer 27

Amplitude modulation

Question 28

How dies AM work?

Answer 28

AM changes the amplitude of the carrier wave

Question 29

What does FM stand for

Answer 29

Frequency modulation

Question 30

How does FM work?

Answer 30

FM change the frequency of the carrier wave

Question 31

Which travels further AM or FM?

Answer 31

AM

Question 32

What do ADSL modems use to send information?

Answer 32

Digital signal

Question 33

What do optic fibre modems use to send a signal?

Answer 33

Light pulses along glass fibres

Question 34

What EMR do TVs use?

Answer 34

Radio waves

Question 35

Do TVs have a digital or analogue signal?

Answer 35

Digital

Question 36

What type of EMR do mibile phones use?

Answer 36

Microwaves

Question 37

Explain how a message gets from one mobile phone to another

Answer 37

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.

Question 38

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

Answer 38

Yes