Which is the wrong statement in following sentences? A device in … - Vidyadip

Question

Which is the wrong statement in following sentences? A device in which P and N-type semiconductors are used is more useful then a vacuum type because(a) Power is not necessary to heat the filament(b) It is more stable
(c) Very less heat is produced in it(d) Its efficiency is high due to a high voltage across the junction

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Answer

(d) Its efficiency is high due to a high voltage across the junction

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