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
[MP PET 1992]
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D
Its efficiency is high due to a high voltage across the junction
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