electromagnetic waves -CH13

radio waves

1st on spectrum

radios, bluetooth, tv as they are low energy and not harmful

uses of radio waves

microwaves

2nd on spectrum

microwaving, satellites as they travel in straight lines and then back

uses of microwaves

infrared

3rd on spectrum

electrical heating and infrared cameras which are red when hot, cooking as infrared is emitted and absorbed by food

uses of infrared

5th on spectrum

visible light

vision, fibre optic cables as energy can travel down without being lost to the sides

uses of infrared

6th on spectrum

ultra violet

uses of uv

sunbeds, energy efficient bulbs

x-ray

7th on spectrum

medical imaging and treatments as they penetrate soft tissues but not bone, a photographic plate behind shadows where the bones are

uses of x-rays

gamma rays

8th on spectrum

sterilising food and equipment and medical treatment as high energy which destroys bacteria and cells

uses of gamma

highest wavelength

at beginning

highest energy

at the end

wave speed=

frequency x wavelength

changes in nuclei changes the frequency, uv has skin cancer risk, and some are ionising

dangers of electromagnetic waves

the shorter the wavelength

the more information carried, the shorter the range