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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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Pitch is the tone of the note/ssong. (high or low) intensity involves speed, loudness, business and strength in a piece.
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