If N_h and N_e are the numbers of holes and c | vedclass

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(D) An extrinsic semiconductor is formed by adding impurities to an intrinsic semiconductor. There are two types of extrinsic semiconductors:$1$. $P$-

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$N_h > N_e$ or $N_h < N_e$ depending on the nature of the impurity.

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(D) An extrinsic semiconductor is formed by adding impurities to an intrinsic semiconductor. There are two types of extrinsic semiconductors:$1$. $P$-type semiconductor: Formed by adding trivalent impurity atoms. In this case,holes are the majority charge carriers,so $N_h \gg N_e$.$2$. $N$-type semiconductor: Formed by adding pentavalent impurity atoms. In this case,electrons are the majority charge carriers,so $N_e \gg N_h$.Therefore,the relationship between $N_h$ and $N_e$ depends on the type of impurity added to the semiconductor. Thus,option $(d)$ is correct.

If $N_h$ and $N_e$ are the numbers of holes and conduction electrons in an extrinsic semiconductor,respectively,then:

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