What exactly is the wavelength?
The distance between the peaks or the distance between the troughs of the waves is the length of one wave, or more precisely the wavelength. Note that the electromagnetic waves vary in length from one end of the spectrum to the other. Some radio waves may be several miles longs, while X and gamma rays are measured in angstroms, and fractions of angstrom. An angstrom unit is equivalent to 0.00000001 centimeters (100 millionths cm). If you want to compare this to an inch, a centimeter is equal to 0.394 inch. You can see that the wavelength as measured in angstrom units is extremely small.
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