If $n_e$ and $n_h$ are the number of electrons and holes in a semiconductor heavily doped with phosphorus, then
A$n_e>>n_h$
B$n_e\lt n_h$
C$n_e \leq n_h$
D$n_e=n_h$
[MP PMT 2000]
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A$n_e>>n_h$
(a) Phosphorus is a pentavalent impurity so $n>n$.
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The amplification factor of a triode is $50.$ If the grid potential is decreased by $0.20\ V$, what increase in plate potential will keep the plate current unchanged