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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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which one of the following engine has thr highest effeciency carnot engine or rankine engine or otto engine?
the theory for this motion
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