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Q.

The intrinsic charge carrier density in germanium crystal at 300K is 2.5 × 1013/cm3. If the electron density in an n-type germanium crystal at 300K be 5 × 1016/cm3, the hole density in this n-type crystal at 300K would be

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a

2.5 × 1013/cm3

b

0.2 × 104/cm3

c

1.25 × 1010/cm3

d

5 × 106/cm3

answer is C.

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Detailed Solution

ne×nh=ni2 ⇒nh=2.5×2.5×10265×1016 ⇒nh=1.25×1010/cm3

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