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General IGCSE Physics 2 > Using Waves > Flashcards

Flashcards in Using Waves Deck (12):
0

The electromagnetic spectrum

Radio waves
Microwaves
Infra red
Visible light
Ultraviolet
X-rays
Gamma rays

1

Radio waves

Sources - radio transmitters
Detectors - radios TV aerials
Uses - fm radio and TV signals

2

Properties of EM waves

- transfer energy
- transverse waves
- travel at the speed of light in a vacuum
- can be reflected, refracted and diffracted

3

Microwaves

Sources - microwave transmitters and ovens
Detectors - microwave receivers
Uses - mobile communication, cooking

4

Infra red

Sources - anything hot
Detectors - skin, blackened thermometer
Uses - night vision, tv remotes and inferred cookers

5

Visible light

Sources - luminous objects
Detectors - the eye, photographic film
Uses - seeing communication photography

6

Ultraviolet

Sources - UV lamps and the sun
Detectors - skin photographic film and some fluorescent chemicals
Uses - fluorescent tunes and UV tanning lamps

7

X-rays

Sources - X-ray tubes
Detectors - photographic film
Uses - internal observation

8

Gamma rays

Sources - radioactive materials
Detectors - Geiger-muller tube
Uses - sterilising equipment and food, radiotherapy

9

Dangers of electromagnetic waves

Radio waves -
Microwaves - burning of tissue
Infra red - skin burns
Visible light - damage the eyes
Ultraviolet lift - damage to skin and eyes
X-rays - can cause cancer
Gamma rays - can cause mutations

10

Digital signals

Information is converted to a binary code
Regeneration of digital signals creates a clean, accurate copy of the signal
Easier to design

11

Analogue signals

Imitation is converted to electrical voltages or varying currents