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Radio Waves

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by

Mara Avramescu

on 4 October 2015

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Transcript of Radio Waves

What are radio waves?
What are the types of radio waves?
long waves
Long and medium waves
diffract (bend) around hills and the curved surface of the Earth
The Very Large Array (VLA)
Thank you for your attention!
Sources:
http://science.hq.nasa.gov/kids/imagers/ems/radio.html
Facts about radio waves
Discovered in the 1880s by Heinrich Hertz
Radio Waves

naturally produced by stars
artificially produced through antennas
they have the highest wavelenghts: can be as long as a football field
medium waves
microwaves
short waves
VHF ( Very High Frequency)
UHF (Ultra High Frequency)
VHF & UHF
do not diffract
they are used for TV broadcasts
Microwaves
highest frequency, shortest wavelenght
contain the least energy
There are radio waves longer than the Earth's diameter
Many of the greatest astronomic discoveries were made by using radio waves
New Mexico
27 radio antennas

AM (Amplitude Modulation) waves:
poorer sound quality, but it can be transmitted over longer distances
FM (Frequency Modulation) waves:
impacted by physical barriers, yet the quality of the sound is better
http://www.diffen.com/difference/AM_vs_FM
by Mara Avramescu
Full transcript