A pedagogical experiment is described for a determination of the speed of light by measurements of the dimensions and resonance frequency of an LRC circuit. The only calibrated devices employed are instruments for measuring frequency and length. An accuracy of approximately 1% is achieved.
REFERENCES
1.
See, for example,
E. Richard
Cohen
and Barry N.
Taylor
, “The Fundamental Physical Constants
,” Phys. Today
52
(8
), BG5
–BG9
(1999
).2.
James C. Maxwell, A Treatise on Electricity and Magnetism (Dover, New York, 1954), Vol. II, pp. 434–436.
3.
See Ref. 2, Vol. I, pp. 45 and 46.
4.
See Ref. 2, pp. 416 and 417.
5.
For a somewhat less neutral Maxwellian passage, see
J. Clerk
Maxwell
, “A Dynamical Theory of the Electromagnetic Field
,” Philos. Trans. R. Soc. London
155
, 459
–512
(1865
);J. Clerk
Maxwell
, an excerpt is reprinted as “Maxwell’s Great Discovery
” in Am. J. Phys.
58
(12
), 1130
(1990
).6.
K. D.
Froome
, “A new determination of the free-space velocity of electromagnetic waves
,” Proc. R. Soc. London, Ser. A
247
, 109
–122
(1958
).7.
Robert S. Elliot, Electromagnetics (McGraw–Hill, New York, 1966), pp. 187–189.
8.
Albert Campbell and Ernest C. Childs, The Measurement of Inductance, Capacitance and Frequency (Van Nostrand, New York, 1935), p. 139.
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© 2001 American Association of Physics Teachers.
2001
American Association of Physics Teachers
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