Using short wavelengths Flashcards
1
Q
Visible light
A
part of electromagnetic spectrum that our eyes detect
2
Q
Infrared radiation
A
devices can transfer energy to foods through infrared radiation
food absorbs radiation and heats up
3
Q
Microwaves
A
used for communications and satellite transmissions
transfers energy to food heating it up
4
Q
radio waves
A
used to transmit radio broadcasts and other communications
5
Q
how are radio waves produced
A
by oscillations in electrical circuits
6
Q
How can radio waves be receieved
A
By an aerial, which could be a metal rod or wire
the radio waves are absorbed by metal and causes oscillations in electrical circuits connected to aerial
7
Q
How are frequencies of radio waves refracted
A
if they reach the ionosphere at a certain angle, the can be refracted and directed back into the earth
