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UV-A pp 1-6 | Cite as

The Spectrum of Electromagnetic Radiation: UV-A in Perspective

  • John A. Parrish
  • R. Rox Anderson
  • Frederick Urbach
  • Donald Pitts

Abstract

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.

Keywords

Electromagnetic Radiation Ultraviolet Radiation Electromagnetic Energy Mycosis Fungoides Ultraviolet Photon 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1978

Authors and Affiliations

  • John A. Parrish
    • 1
  • R. Rox Anderson
    • 1
  • Frederick Urbach
    • 2
  • Donald Pitts
    • 3
  1. 1.Harvard Medical SchoolUSA
  2. 2.Skin and Cancer HospitalTemple University School of MedicineUSA
  3. 3.College of OptometryUniversity of HoustonUSA

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