Wavelength Independence of the Velocity of Light in Space

Details Wavelength Independence of the Velocity of Light in Space Wavelength Independence of the Velocity of Light in Space

Apr 1969

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969natur.222..157w&link_type=abstract

Nature, Volume 222, Issue 5189, pp. 157-158 (1969).

Astronomy and Astrophysics

Astronomy

22

Scientific paper

BECAUSE of the great distances involved, time measurements on astronomical events afford the best possibility for a high precision determination of the relative velocities of electromagnetic radiation at different wavelengths1. A discussion of flare stars, observed nearly simultaneously at optical and radio wavelengths, resulted in a relative uncertainty Δc/c of 4 × 10-7 over the wavelength range 0.54 microns-1.2 m. This gives a value of the product p=(c/Δc) (λ2/λ1) of about 5 × 1012, which is a factor of 10 greater than that which has been achieved in the laboratory2.

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