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Electronics and Communication Engineering - Electromagnetic Field Theory

Exercise : Electromagnetic Field Theory - Section 8
36.
In an intrinsic semiconductor, the intrinsic charge concentration at any absolute temperature T is proportional to
T
T2
T3
T4
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
The conductivity of an intrinsic semiconductor is (symbols have the usual meanings).
generally less than that a doped semiconductor
σi = eni (μn - μp)
σi = eni (μn + μp)
σi = ni (μn - μp)
Answer: Option
Explanation:
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38.
The current due to thermionic emission is proportional to
T
T2
T3
T4
Answer: Option
Explanation:
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39.
For radiating ultraviolet rays, LEDs use
zinc sulphide
gallium arsenide
gallium phosphide
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.
Addition of a small amount of antimony to germanium will result in
formation of p-type semiconductor
more free electrons than holes in semiconductor
antimony concentrating on the edges of the crystal
increased resistance
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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