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(B) In an intrinsic semiconductor,thermal energy at room temperature is sufficient to excite electrons from the valence band to the conduction band.Fo

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(B) In an intrinsic semiconductor,thermal energy at room temperature is sufficient to excite electrons from the valence band to the conduction band.For every electron excited to the conduction band,a corresponding hole is created in the valence band.Therefore,the number density of electrons $(n_e)$ is equal to the number density of holes $(n_h)$,such that $n_e = n_h = n_i$,where $n_i$ is the intrinsic carrier concentration.

In an intrinsic semiconductor at room temperature,the number of electrons and holes are

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