P12 Flashcards
What are the uses and dangers of radio waves?
Uses: Television broadcasts and military communications.
Dangers: No danger
What are the uses and dangers of microwaves?
Uses: Cooking food and satellite communications.
Dnagers: Exposure to high levels of microwaves can cause a painful burn.
What are the uses and dangers of Infared?
Uses: Electrical heaters and remote controls.
Dangers: Burn skin.
What are the uses and dangers of visible light?
Uses: Photography, illumination and fibre optic communications.
Dangers: Can damage the reting at the back of the eye.
What are the uses and dangers of ultraviolet?
Uses: Killing bacteria and photography.
Dangers: Skin cancer
What are the uses and dangers of X-rays?
Uses: Checking for fractures and chest x-rays can spot pneumonia.
Dangers: Vomiting and increase the risk of cancer.
What are the uses and dangers of gamma-rays?
Uses: radiotherapy and sterilization/ disinfection.
Dangers: They can stop alphq and beta particles and can cause cancer.
What is the order of wave length (highest to smallest)?
Radio waves, micro-waves, Infarred, Visible light, Ultra-violet, X-rays, Gamma-rays.
What is the equation to find Wave Speed?
Wave Speed= Frequency x Wavelength
What is the benefit of carrying light through optical fibres?
They can carry light around corners.
What are the 4 greenhouse gasses?
CO2, CH4, H2O, NOx.
