Silicon has the diamond structure with a unit cell edge length of 5.43 Å and eight atoms per unit cell.
(a) How many silicon atoms are there in 1 cm3 of material? (b) Suppose you dope that 1 cm3 sample of silicon with 1 ppm of phosphorus that will increase the conductivity by a factor of a million. How many milligrams of phosphorus are required?
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