A) True or false ? : In order for electrons to move as in a current, there must

Question

A) True or false ? : In order for electrons to move as in a current, there must be empty energy levels just below for them to move into and then flow.

B) An electron energy diagram is drawn below. Black represents levels filled with electrons and grey represents empty energy levels.

This material is a__. When hooked to a battery, electrons in the lower band will When hooked to a battery, electrons in the upper band will a) conductor, move, move b) semi-conductor in the dark, not move, move. c) semi-conductor in the light, move, move. d) semi-conductor in the light, not move, move. e) insulator, not move, not move.

Explanation / Answer

The material is a semi conductor because valency band is filled and energy difference exists.

indarkaswell as light, because free energy states are available in conduction band,

So holes willbe created in valency band and electrons in conduction band.

So semi conductor in light not move, move

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