CECS 5400

Educational Telecommunications

Summer 2006

Radio Frequencies

Discussion of Chart audio ra

Frequency Chart


Calculating the Frequency of Wavelengths
Wavelength- The distance between successive crest or trough in a wave
Frequency- The number of complete waves passing a point in a given amount of time  s-1 or 1 per second or 1/s and is now called a hertz
Amplitude- The maximum height of a wave, as measured from the axis of propagation Nodes- Points of zero amplitude
Calculating Wave Length
Wavelength (m) X Frequency (s-1) = velocity (m/s)
C = 2.99792458 X 108 m/s -1
Example Question
The frequency of the radiation used in all microwave ovens sold in the US is 2.45 GHz. (109 s-1) What is the wavelength (in meters) of this radiation?
Answer
2.998 x 108 ms-1 / 2.45 X 109 s-1 = .122 m Note The s-1 cancel each other out