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A crystal with 5 x 10^28 Si atoms per m^3 gets 1 ppm of arsenic. Its electron density is about:
A1.5 x 10^16 /m^3
B4.5 x 10^9 /m^3
C5 x 10^28 /m^3
D5 x 10^22 /m^3
Answer & Solution
Correct answer: D. 5 x 10^22 /m^3
One part per million of 5 x 10^28 gives 5 x 10^22 donors per m^3, and thermal electrons are negligible beside this.
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