Some Recent Determinations of the Velocity of Light. II

Abstract

Four methods developed during the past five years for the determination of the velocity of light in vacuo are reviewed. These include coincidence-counter determinations of gamma-ray velocities, band-spectra methods, Froome's microwave interferometer, and Florman's radiofrequency interferometer. The results of recent repetitions of Bergstrand's geodimeter measurement of c are also summarized. The best measurements by a variety of techniques yield a weighted average of 299 792.8 km/sec for c, with a probable error of ±0.2 km/sec. A reasonable limit of error of ±0.6 km/sec is recommended. Some reasons for the low values of c obtained previously by optical techniques are discussed.

Cite this work

No public copy is stored for this record, so only the metadata is cited.

Stored only when both papers are in the corpus — 18 citations exist upstream.