P12

Question 1

What are the uses and dangers of radio waves?

Answer 1

Uses: Television broadcasts and military communications.

Dangers: No danger

Question 2

What are the uses and dangers of microwaves?

Answer 2

Uses: Cooking food and satellite communications.

Dnagers: Exposure to high levels of microwaves can cause a painful burn.

Question 3

What are the uses and dangers of Infared?

Answer 3

Uses: Electrical heaters and remote controls.

Dangers: Burn skin.

Question 4

What are the uses and dangers of visible light?

Answer 4

Uses: Photography, illumination and fibre optic communications.

Dangers: Can damage the reting at the back of the eye.

Question 5

What are the uses and dangers of ultraviolet?

Answer 5

Uses: Killing bacteria and photography.

Dangers: Skin cancer

Question 6

What are the uses and dangers of X-rays?

Answer 6

Uses: Checking for fractures and chest x-rays can spot pneumonia.

Dangers: Vomiting and increase the risk of cancer.

Question 7

What are the uses and dangers of gamma-rays?

Answer 7

Uses: radiotherapy and sterilization/ disinfection.

Dangers: They can stop alphq and beta particles and can cause cancer.

Question 8

What is the order of wave length (highest to smallest)?

Answer 8

Radio waves, micro-waves, Infarred, Visible light, Ultra-violet, X-rays, Gamma-rays.

Question 9

What is the equation to find Wave Speed?

Answer 9

Wave Speed= Frequency x Wavelength

Question 10

What is the benefit of carrying light through optical fibres?

Answer 10

They can carry light around corners.

Question 11

What are the 4 greenhouse gasses?

Answer 11

CO2, CH4, H2O, NOx.