6.6.2.4 uses and applications of electromagnetic waves

Question 1

What are radio waves used for

Answer 1

Television and radio

Question 2

What are microwaves used for

Answer 2

Satellite communications, cooking food

Question 3

What is infrared used for

Answer 3

Electrical heaters, cooks food, infrared cameras, remote controls, thermal imaging, night vision, motion sensing

Question 4

What is visible light used for

Answer 4

Fibre optic communications, seeing/ taking photos or videos

Question 5

What is ultraviolet used for

Answer 5

Energy efficient lamps and sun tannnig, security marking (fluorescence), fluorescent bulbs

Question 6

What are X-rays used for

Answer 6

X-ray imaging, airport security (detecting illegal items etc)

Question 7

What are the uses of gamma rays

Answer 7

Sterilising medical instruments/ treating cancer

Question 8

What are dangers of radio waves

Answer 8

No known Danger

Question 9

What are dangers of microwaves

Answer 9

Possible heat damage to internal organs

Question 10

What are dangers of infra-red

Answer 10

Skin burning

Question 11

What are dangers of visible light

Answer 11

Bright light can cause eye damage

Question 12

What are dangers of ultraviolet

Answer 12

Eye damage, sunburn, skin cancer

Question 13

What are dangers of X-rays

Answer 13

Kills cells, mutations, cancer

Question 14

What are dangers of gamma rays

Answer 14

Kills cells, mutations, cancer,

Question 15

What is the order of electromagnetic waves

Answer 15

Gamma rays, X-rays, ultraviolet, visible light, infra-red, microwaves, radio waves .

Question 16

What is the speed of light in m/s

Answer 16

300,000,000 m/s (rounded)