The integral of this function between any two energies is the contribution to the total irradiance from all photons with energies in this range.
High Energy Astrophysics: Particles, Photons and Their Detection Vol 1, Malcolm S. Longair, ISBN: 0521387736
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For example, photons have momenta, which can be transferred to objects (as evidenced by radiation pressure), and yet the photon has zero rest mass.
The energy produced through fusion at the core moves outward, first in the form of electromagnetic radiation called photons. Next, energy moves upward in photon heated solar gas--this type of energy transport is called convection.
 See also: Surface, Radiation, Maximum, Force, Wind
  
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