Electromagnetic Wave Propagation. High School Science Demonstration Melanie Leong June 25, 2003. Early Radio to Radio Astronomy A Brief History of Radio & A Quick Introduction to Radio Astronomy. Onizuka Visitor Center Presentation Melanie Leong July 5, 2003. Agenda.
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High School Science Demonstration
June 25, 2003
Onizuka Visitor Center Presentation
July 5, 2003
One. Two. Three. Four.
Is it snowing where you are Mr. Theissen?
If it is, telegraph back and let me know.”
Transmit and receive stations were only 1 mile apart, but this heralded the beginning of radio telephony.
Example: The wavelength of a signal resonating at 3kHz is:
3 x 108 m/s = 100 kilometers or ~ 62 miles!
3 x 103 Hz