![]() (credit “Cosmic ray”: modification of work by NASA credit “PET scan”: modification of work by the National Institute of Health credit “X-ray”: modification of work by Dr. Examples of some applications for various wavelengths include positron emission tomography (PET) scans, X-ray imaging, remote controls, wireless Internet, cellular telephones, and radios. Portions of the electromagnetic spectrum are shown. ![]() For example, radio waves are usually specified as frequencies (typically in units of MHz or GHz), while the visible region is usually specified in wavelengths (typically in units of nm or Å). Given the expansive range of wavelengths, different units are typically used for different parts of the spectrum. It spans an enormous range-wavelengths of kilometers (10 3 m) to picometers (10 −12 m) have been observed, and the visible-light range makes up only a small portion of it. ![]() = \lambda\nu \nonumber \]īecause the product λv is constant, wavelength and frequency are inversely proportional: as the wavelength increases, the frequency decreases.įigure 3 shows the electromagnetic spectrum, the range of all types of electromagnetic radiation. ![]()
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