# The velocity of propagation of electromagnetic waves derived from the resonant frequencies of a cylindrical cavity resonator

@article{Essen1948TheVO, title={The velocity of propagation of electromagnetic waves derived from the resonant frequencies of a cylindrical cavity resonator}, author={Louis Essen and A. C. Gordon-Smith}, journal={Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences}, year={1948}, volume={194}, pages={348 - 361} }

- Published in Proceedings of the Royal…1948
DOI:10.1098/rspa.1948.0085

in which vQ is the free-space velocity of electromagnetic waves, D and L are the internal diameter and length respectively of the cylinder, r is a constant for a particular mode of resonance, n is the number of half-wave-lengths in the resonator and Q is the quality factor. Assuming the validity of this equation the value of v0 can be obtained from measured values o f /, £>, L and Q. A copper cylinder of diameter approximately 7*4 cm. and length 8*5 cm. was constructed with the greatest… CONTINUE READING

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