Abstract

A free running multivibrator suitable for the student laboratory is described, in which a solid state light emitter and a photomultiplier tube coupled to it through a long light path are used as the regenerative feedback loop. The rms frequency deviation from the mean of one such oscillator is determined to be three parts in 107 over a period of several hours. By changing the optical path, a frequency change is introduced from which the speed of light c is determined. At present, the precision is limited by the optical system, the percentage error in the value of “c” being still two orders of magnitude greater than in the best modern measurements. Various tests, sources of error, and possible improvements are discussed with the idea that this method might eventually be made of comparable precision with that of Bergstrand et al.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.