Materials and Components
In an intrinsic semiconductor, at a given temperature T

The number of electron-hole pairs generated per second due to thermal motion is always less than the number of electron-hole pairs lost per second due to recombination
The number of electrons-hole pairs generated per second due to thermal motion are equal to the number of electron-hole pairs lost per second due to recombination
Any of the above
The number of electron hole pairs generated per second due to thermal motion is always more than the number of electron-hole pairs lost per second due to recombination

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

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