Question

In n-type semiconductor
A) pentavalent impurity are dopants and holes are majority carriers.
B) trivalent impurity are dopants and electrons are minority carriers.
C) pentavalent impurity are dopants and electrons are majority carriers.
D) trivalent impurity are dopants and holes are majority carriers.

• A. A
• B. C
• C. B
• D. D

Hint:

n-type material is doped with pentavalent atoms and has electrons as majority carriers.

Answer 1

The Correct Option is B

Step 1: Doping:
An n-type semiconductor is made by adding a pentavalent impurity (such as phosphorus or arsenic) to silicon or germanium. Each impurity atom has five valence electrons, of which four form bonds and one is left free.

Step 2: Carriers:
The free electrons are the majority carriers. Holes are the minority carriers.

Step 3: Check the Statements:
(A) Says holes are majority carriers, which describes p-type material, so it does not match.
(B) Trivalent impurity with electrons minority: this describes p-type material.
(C) Pentavalent impurity, electrons majority: this describes n-type material.
(D) Trivalent impurity with holes majority: this describes p-type material.

Step 4: Match the Choice:
Statement (C) is the correct one. In the answer list, the option that gives statement (C) is option B.

Final Answer:
Statement (C) is correct, which is option B. \[ \boxed{\text{(B) statement (C)}} \]