Electromagnetic Spectrum Flashcards
Learn about the different radiations within the Em spectrum and their properties
What speed to all electromagnetic waves travel at?
300,000,000 m/s
3x10^8 m/s
Waves with ____ frequency have greater energy and are more harmful
Higher
What can be used to detect radio waves?
TV aerials, or radar detector dishes
What are some sources of radio waves?
Stars in space
Electrical storms
Transmitted using aerials
What are some uses of radio waves?
Communications
Broadcasting radio and TV programmes
Mobile phones and wireless networking
What are some risks of radio waves?
Potential increased cancer risk
Large doses believed to cause cancer
What are some sources of microwaves?
Stars
Mobile phones
Magnetron in a microwave or radar equipment
Uses of microwaves?
Heating food in microwave oven
Predicting weather
Mobile phones
Navigation of ships and aircrafts
What is used to detect microwaves?
Aerials
Diode probe
Hazards of microwaves?
Heating of body tissues
Damages eyesight, causing cataracts
Sources of infrared rays?
Remote controls
Objects that emit heat - stars, flames, lamps, people etc.
What is used to detect infrared rays?
Phototransistor
Blackened thermometer
Uses of infrared rays?
Heating source
Medical diagnosis and treatment
To find people lost at sea
Security on banknotes
Hazards of infrared rays?
Heating of body tissues, which can cause burning
Sources of visible light?
Stars
Anything that glows eg. Light bulbs
