Chapter 12: Electromagnetic Waves Flashcards
1
Q
Electromagnetic Spectrum
A
From:
longer wavelength
lower frequency
Radio waves Microwaves Infrared Visible light Ultraviolet X-rays Gamma-rays
2
Q
Properties of electromagnetic waves
A
- Transverse waves
- Travel through vacuum
- Transfers energy from one place to another
- They travel at the same speed of 3 x 10^8 in vacuum
- Wave speed formula applies to all electromagnetic waves
- Travels from one medium to another, it’s speed and wavelength change, but frequency does not change
- Obey the laws of reflection and refraction
- They carry no electric charge
3
Q
What are the uses of radio waves? Types?
A
- Radios
- Over-the-air television
- Communications
Long wave Medium wave Short wave Very high frequency Ultra high frequency
4
Q
What is the wavelength and uses of long wave, medium wave and short wave?
A
WAVELENGTH 10m to 2km USES AM radio Submarine communication
5
Q
What is the wavelength and uses of ultra high frequency and very high frequency?
A
WAVELENGTH 10cm to 10m USES FM radio Over-the-air television
6
Q
What are the uses of microwaves?
A
Microwave oven
Satellite television
Global positioning system
7
Q
What are the uses of infrared?
A
Remote controllers
Ear thermometers
Intruder alarms
8
Q
What are the uses of visible light?
A
Optical fibres
9
Q
What are the uses of ultraviolet?
A
Sunbeds
Sterilisation of equipment
10
Q
What are the uses of x-rays?
A
Radiation therapy, imaging of bones and detection of flaws in heavy metal equipment
11
Q
What are the uses of gamma rays?
A
Radiation therapy
