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Electronics — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsElectronics1 Mark
Question
Assertion : The number of electrons in a $P$-type silicon semiconductor is less than the number of electrons in a pure silicon semiconductor at room temperature.
Reason : it is due to law of mass action.
✓

Answer

(a) According to law of mass action, $n_i^2=n_e n_h$. In intrinsic semiconductors $n=n=n$ and for $P$-type semiconductor $n$. would be less than $n$, since $n$ is necessarily more than $n$.

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