Consider the following statements with regard to semiconductors:1. In n-type material free electron concentration is nearly equal to the density of donor atoms.2. 1 part in 108 donor type impurity added to Ge improves its conductivity at 30°C by a factor of 12.3. Phosphorus is an example of n-type impurity.4. Conductivity of Si is more sensitive to temperature than Ge.Which of these statements are correct?

Consider the following statements with regard to semiconductors:1. In

1.	Consider the following statements with regard to semiconductors:1. In n-type material free electron concentration is nearly equal to the density of donor atoms.2. 1 part in 108 donor type impurity added to Ge improves its conductivity at 30°C by a factor of 12.3. Phosphorus is an example of n-type impurity.4. Conductivity of Si is more sensitive to temperature than Ge.Which of these statements are correct?
A.	1, 2 and 3 only
B.	1, 3 and 4 only
C.	2 and 4 only
D.	1, 2, 3 and 4
Answer» E.