The Spectrum of Electromagnetic Radiation: UV-A in Perspective
Continuous thermonuclear reactions in the sun’s core yield a wide spectrum of electromagnetic energy that radiates through space in all directions. This radiant energy is called electromagnetic because it is in the form of oscillating electric and magnetic fields. Electromagnetic radiation exhibits both wavelike (oscillating field) and particlelike (discrete packet) properties. These discrete packets, or quanta, are called photons. The number of oscillations per second (frequency) times the distance traveled through space per oscillation (wavelength) is the velocity of light. Because all photons travel through space at this velocity, wavelength and frequency are inversely proportional. Max Planck, in 1900, determined that the energy carried by a photon is directly proportional (Planck’s constant) to its frequency. Therefore, shorter wavelength, higher frequency electromagnetic radiations consist of photons of higher energy.
KeywordsElectromagnetic Radiation Ultraviolet Radiation Electromagnetic Energy Mycosis Fungoides Ultraviolet Photon
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