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When electric field is applied across a semiconductor,

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electrons move from lower energy level to higher energy level in the conduction band.

electrons move from higher energy level to lower energy level in the conduction band.

holes in the valence band move from higher energy level to lower energy level.

holes in the valence band move from lower energy level to higher energy level.

answer is A, C.

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Detailed Solution

Electrons take the energy and move up to next higher level both in conduction and valance band. So, a hole move downwards due to movement of electron.

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