Electromagnetic Waves Flashcards
Order of electromagnetic waves
Radio, micro, infra red, visible light, ultra violet, x rays, gamma
When happens as you go up the EM spectrum
Increasing frequency and decreasing wavelength
How was infrared radiation discovered by Hershel
Split light with a prism and took the temperature of each colour and discovered it was hotter last red
How was ultraviolet discovered by Ritter
But silver chloride past blue and saw that it turned black the fastest
Dangers of microwaves
Heat body cells, suggested link to cancer
How is infrared dangerous
Causes burns
Dangers of ultra violet
Cell mutations causing cancer or eye damage
Dangers of gamma and x rays
Cause cell mutations and cancer
What is long wave radio
Wavelengths of 1-10km and be received half way across the world as the bend around the world
What is short wave radio
10-100m and are reflected in the ionosphere
How do microwaves in satellite communication work
Transmitted into space, picked up by orbiting dish and is transmitted back to earth
How is infrared radiation used to monitor temperature
Infrared is given off by hot objects
What do optical fibres do
Carry data over long distances as pulses or infrared. They bounce waves off the inner core
What happens when light goes into our eyes
It gets refracted through the lens and focused on the retina at the back of the eye and it gets sent to the brain
What is radiotherapy
Treatment of cancer with gamma cells but damage happens to normal cells
