EM Waves' Dangers And Uses Flashcards
radiowaves uses
transmit television and radio programmes
radiowaves dangers
large doses cause cancer and leukuemia
microwave uses
heat up food and use in mobile phones
microwaves dangers
internal heating of body tissue
infared uses
remote controls and recorders
infared dangers
heat causes skin cancer and burns
visible light uses
light up environment
visible light dangers
blinding of eyes and thermal heat if concentrated
ultraviolet light uses
killing microbes and makes clothes glow
ultraviolet dangers
severe burns and damage to cells
x ray uses
see inside people and airport security
x ray dangers
damage cells and cause mutations
gamma ray uses
kill cancer cells and radiotherapy
gamma ray dangers
cause genetic mutation
why dont we need satellites for radiowaves
- because radiowaves are reflected back to earth by the ionosphere
- this is because its frequency is too low so it therefore doesnt have enough power to escape