Equivalence of Some Integrals of the Radiation Theory

Details Equivalence of Some Integrals of the Radiation Theory Equivalence of Some Integrals of the Radiation Theory

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..46..239c&link_type=abstract

Astrophysics and Space Science, Volume 46, Issue 1, pp.239-246

Astronomy and Astrophysics

Astrophysics

Scientific paper

A definite integral which occurs in radiation theory is shown to be equal in value to another definite integral by evaluating the flux from a spherically symmetrical radiating sphere in two ways. As a corollary, an alternate proof of the invariance of the specific intensity of a ray in empty space along its path is presented. Furthermore, the equality of these two indefinite integrals leads to the conversion of members of a class of indefinite and definite integrals involving arbitrary functions of angle into other integrals. These transformations facilitate the calculation of some of these integrals which arise not only in the theory of radiation, but in other physical situations with spherical or axial symmetry — especially those in which inverse-square laws are involved.

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