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• In a vacuum, all electromagnetic radiation travels at 3.00 x 10 8 m/s,  a constant called the speed of light (c):

• Radiation of high frequency has a short wavelength, and vice versa.

_ is expressed in meters, nanometers (nm, 10 –9 m), picometers (pm, 10 –12 m), and angstroms (Å, 10 –10 m).

• The speed of the wave (m/s) is the product of its frequency (cycles  per second) and its wavelength (meters per cycle):

• Wavelength ( _, Greek lambda) is the distance between any point  on a wave and the corresponding point on the next wave.

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