EM uses and threats

Question 1

Radio Waves: use

Answer 1

• TV signals

- radio signals

Question 2

Quality of Radio waves (4)

Answer 2

• longest wave in em spectrum
• can travel long distances
• can diffract around hills and curved surfaces
• carry info with energy they transfer

Question 3

Microwaves: use

Answer 3

• mobile phones

- satellite TV

Question 4

Quality of microwaves

Answer 4

-pass easily through earth’s watery atmosphere

Question 5

Danger of microwaves?

Answer 5

• emit microwaves radiation
• can be harmful to bells (cell damage)
• hasn’t been proven (insufficient evidence)

Question 6

Infrared radiation: use

Answer 6

• remote controls

- fibre optic cables

Question 7

Infrared qualities

Answer 7

no loss of signal in fibre optics cuz total internal reflection

Question 8

infrared hazard

Answer 8

overheating

Question 9

UV uses

Answer 9

• tanning of skin

- detecting forgeries

Question 10

UV dangers

Answer 10

-can cause skin cancer

Question 11

Xray uses

Answer 11

xray machine to create images of bones/teeth

Question 12

Xray Dangers

Answer 12

-overexposure could lead to cancer/cell mutation

Question 13

Gamma uses

Answer 13

• destroy cancer cells (radio therapy)

- sterilise equipment

Question 14

Quality of gamma waves

Answer 14

shortest wavelength in EM spectrum

Question 15

Dangers of gamma waves

Answer 15

overexposure can cause cell mutation/ cancer

Question 16

Visible light

Answer 16

• photogrpahy

- fibre optic cables

Question 17

Visible light quality

Answer 17

-no loss of signal in fibre optic cuz total internal reflection