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(i) The procedure of ejection of electrons from a metal surface by the application of heat is known as thermionic emission and emitted electrons are known as thermions and current flowing is known as thermion current.
(ii)Thermions have dissimilar velocities.
(iii)This was discovered by Edison
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Define Wave Length Wave Length : The distance travel by a wave during the interval in which the particle of the medium done on vibration is called wavelength
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