An Observer moving in the 3° K Radiation Field

Details An Observer moving in the 3° K Radiation Field An Observer moving in the 3° K Radiation Field

Sep 1968

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968natur.219.1343b&link_type=abstract

Nature, Volume 219, Issue 5161, pp. 1343-1344 (1968).

Physics

15

Scientific paper

IF an observer is situated in a radiation field and observes that the radiation is black-body radiation of temperature T, then a second observer moving with a velocity v relative to the first will observe a different spectrum, and the spectrum will depend on the direction in which he looks. It is generally assumed1 that the second observer, using the same radiometer as the first, would receive more power from the direction in which he is moving, but, according to a defective derivation by Condon and Harwit2 based on photon counts, a detector receives less power from an approaching source than from a receding one, if hv/kT < 1.60. This also implies that the spectrum no longer appears as a black-body spectrum.

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