Consider the following statements used in respect of the phenomenon- Population Inversion:
1. It means population in a higher state is higher than that in a lower state
2. It is observed under thermal equilibrium
3. It increases the rate of spontaneous emission
4. It increases the rate of stimulated emission
Which of the statements given above are correct?
A. 1, 2, 3 and 4
B. 2 and 3 only
C. 1 and 3 only
D. 1 and 4 only
Answer: Option D
This Question Belongs to Electronics And Communications Engineering >> Electronic Devices And Circuits
The forbidden energy gap between the valence band and conduction band will be least in case of
A. Metals
B. Semiconductors
C. Insulators
D. All of the above
For a NPN bipolar transistor, what is the main stream of current in the base region?
A. Drift of holes
B. Diffusion of holes
C. Drift of electrons
D. Diffusion of electrons
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true
For a P-N diode, the number of minority carriers crossing the junction depends on
A. Forward bias voltage
B. Potential barrier
C. Rate of thermal generation of electron hole pairs
D. None of the above
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