The Electromagnetic spectrum Flashcards
1
Q
List the seven types of waves in order(increasing frequency, decreasing wavelength)
A
- Radio waves
- Micro waves
- Infrared
- Visible light
- ultraviolet
- X- Rays
- Gamma Rays
2
Q
Who discovered infrared in 1800
A
William Herschel
3
Q
How?
A
- 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.
4
Q
Who discovered U.V radiation in 1801?
A
Ritter
5
Q
How?
A
- 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.
6
Q
What are dangers of microwaves
A
- Heat body cells
7
Q
What are the dangers of infrared?
A
Skin burns
8
Q
what are the dangers of U.V radiation?
A
- Sunburn
- Skin cancer
- Eye damage
9
Q
What are the dangers of gamma/x-rays
A
- Cell mutation
2. Cancer
10
Q
What are radio waves used for?
A
Communications
11
Q
What are microwaves used for?
A
Satellite communications and mobile phones
12
Q
What can infrared radiation be used for?
A
Monitoring temperature
13
Q
What are other uses of infrared?
A
- In cooking, (toasters)
- Remote controls
- Mobile phones/ computers
14
Q
What is one use of U.V radiation
A
Detection of forged bank notes
15
Q
What is the chemical that helps with the detection of fake notes?
A
Fluorescence
