Materials and Components
The resistance of a photoconductor

Increases with increase in light intensity
Remains constant
May increase or decrease with increase in light intensity
Decreases with increase in light intensity

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Materials and Components
At room temperature the number of conducting electrons in an intrinsic semiconductor

Is almost equal to the number of valence electrons
Is small as compared to the number of valence electrons
Is about half the number of valence electrons
Is a very small fraction of the number of valence electrons

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