The Electromagnetic spectrum Flashcards
List the seven types of waves in order(increasing frequency, decreasing wavelength)
- Radio waves
- Micro waves
- Infrared
- Visible light
- ultraviolet
- X- Rays
- Gamma Rays
Who discovered infrared in 1800
William Herschel
How?
- when white light goes through prism,makes spectrum
- wanted to now about heat in each colour, put thermometer in each one.
- He noticed that they increased form violet to red.
- Measured temperature passed red part, no light, highest temperature of all, he’d discovered infrared.
Who discovered U.V radiation in 1801?
Ritter
How?
- Knew that silver chloride turned from white to black when in light.
- In dark room, created spectrum of light using light source+ prism+ exposed them to paper.
- Strips changed quickest nearer blue end
- placed strip just past violet, quickest change of all, discovered U.V radiation.
What are dangers of microwaves
- Heat body cells
What are the dangers of infrared?
Skin burns
what are the dangers of U.V radiation?
- Sunburn
- Skin cancer
- Eye damage
What are the dangers of gamma/x-rays
- Cell mutation
2. Cancer
What are radio waves used for?
Communications
What are microwaves used for?
Satellite communications and mobile phones
What can infrared radiation be used for?
Monitoring temperature
What are other uses of infrared?
- In cooking, (toasters)
- Remote controls
- Mobile phones/ computers
What is one use of U.V radiation
Detection of forged bank notes
What is the chemical that helps with the detection of fake notes?
Fluorescence
What is radiotherapy
The treatment of cancer using gamma rays
What is used in the sterilisation of food and surgical instruments?
Gamma rays
What are the other 2 types of ionising radiation apart from gamma rays?
- Beta
2. Alpha
