# Radio Frequencies

Discussion of this information

audio mp3

## Frequency Chart

The following figure shows the Electromagnetic spectrum.

## 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 called a hertz. The following figure is an illustration of wavelength and frequency.

**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 10^{8} m/s^{ -1}

## Example Question

The frequency of the radiation used in all microwave ovens sold in
the US is 2.45 GHz. (10

^{9 }s

^{-1}) What is the wavelength
(in meters) of this radiation?

*ANSWER:*

2.998 x 10^{8} ms^{-1} / 2.45 X 10^{9} s^{-1} = .122 m

*Note:* The s-1 cancel each other out