LOW FREQUENCY EM WAVES Flashcards
Extremely high frequency radio waves
MICROWAVES
A microwave oven uses a _
magnetron
Converts electrical energy into microwave radiation
Magnetron
_ also transmit microwaves
Stars
Can be reflected and absorb
MICROWAVES
Food absorbs but metallic objects reflect them
MICROWAVES
_ objects should not be used in a microwave oven
Metallic objects
Are designed to resist radiation from microwaves
microwave-safe containers
Prolonged exposure to microwaves can cause _
Cataract
_ can also affect parts of your brain
CELL PHONES
Mobile phones use transmitter chips to produce _
MICROWAVES
Have wavelengths between those of microwaves and visible light
INFRARED WAVES
Most of the thermal radiation emitted by objects near room temp is _
INFRARED WAVES
Instruments that allows you to see infrared waves
NIGHT VISION GOGGLES AND INFRARED CAMERAS
Invisible to the naked eye
INFRARED WAVES
Major source of infrared radiation
THE SUN
The amount of infrared radiation emitted by an object depends on the _
Object’s temperature
Is used to keep food hot, to relieve sore muscles,
INFRARED
Are lamps are also a source of infrared radiation
XENON
Can cause damage to the human body, particularly to the eyes and the skin
INFRARED RADIATION
Enables one to see the physical world
VISIBLE LIGHT
Main source of light
THE SUN
Visible light from the _ is one of the raw materials in photosynthesis
SUN
In the absence of sunlight, _ are used as a source of light
LIGHT BULBS
