Electricity and magnetism for advanced students (1920)
Starling, Sydney George, 1873- · London Longmans, Green · leaf 449
cms. in diameter; they may, however, be much more easily obtainedin the case of larger spheres. Minute sparks may be obtained from asimilar sphere several yards away, on bringing a conductor into contactwith it at the ends of a suitable diameter. It has been shown by Sir J. J. Thomson, that the… … XIV. SIGNALLING BY ELECTROMAGNETIC WAVES 43d whose wave-length is 1-4 times the diameter of the sphere. In the caseof a sphere of diameter 5 centimetres, the wave-length of the radiationemitted is therefore 7 cms. The radiation corresponding to visible lightis about 000006 centimetre in…
Electricity · Magnetism
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