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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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Derive expression for total power consumed when three appliances of power p1 p2 nd p3 are connected in series.
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Platinum: Atomic number 78 Symbol p t Atomic weight 195.09 Discovery Olloa 1735
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