1 cm3 of pure Germanium at 20°C contains about 4.2 × 1022 atoms, – McqOptions

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1.	1 cm3 of pure Germanium at 20°C contains about 4.2 × 1022 atoms, 2.5 × 1013 free electrons, and 2.5 × 1013 holes. 0.001% of Arsenic doping donates an extra 1017 free electrons in the same volume. The approximate number of holes in one cm3 in the doped semiconductor under equilibrium condition is:
A.	6.25 × 109
B.	2.5 × 109
C.	10.5 × 109
D.	1017
Answer» B. 2.5 × 109

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