radiowaves Flashcards
how are radio waves produced
oscillations in electrical circuits
what can radio waves induce
oscillations in electrical circuits
what are radio waves used for
communication, satellite transmission
why is exposure of radio waves not as dangerous
it has the lowest frequency so it has less energy
what can radio waves pass through
the earths atmosphere
what can radio waves be transmitted through therefore
the body without being absorbed
why can long wave radio waves be received halfway across the world
long wavelengths bend around the curved surface of the earth so receiver doesn’t have to be in line of sight with the transmitter
why can short wave radio signals be received at long distances from the transmitter
reflected by the earths atmosphere
what does bluetooth use
short wave radio waves to send data over short distances
what kind of radio waves do radio waves for TV and FM radio transmissions use
very short wavelengths, so must be in direct sight of the transmitter
explain how radio waves are produced by oscillating charges
an alternating current is supplied in a circuit and in the TRANSMITTER the electrons oscillate to create radio waves
what happens when radio waves reach a receiver
they waves are absorbed and the energy carried by the waves is transferred to the electrons in the receiver, causing them to oscillate and generate an alternating current
