# Electronic Devices - Semiconductors

Exercise : Semiconductors - General Questions
26.
What occurs when a conduction-band electron loses energy and falls back into a hole in the valence band?
doping
recombination
generation
Explanation:
No answer description is available. Let's discuss.

27.
The maximum number of electrons in each shell of an atom is
2.
2n2 where n is the number of the shell.
4.
8.
Explanation:
No answer description is available. Let's discuss.

28.
A silicon diode is forward-biased. You measure the voltage to ground from the anode at ________, and the voltage from the cathode to ground at ________.
0 V, 0.3 V
2.3 V, 1.6 V
1.6 V, 2.3 V
0.3 V, 0 V
Explanation:

For silicon diodes, the built-in potential is approximately 0.7 V. Thus, if an external current is passed through the diode, about 0.7 V will be developed across the diode such that the P-doped region is positive with respect to the N-doped region and the diode is said to be "turned on" as it has a forward bias.

Therefore, 2.3 V - 1.6 V = 0.7 V. Hence the answer is correct.

29.
The term bias in electronics usually means
the value of ac voltage in the signal.
the condition of current through a pn junction.
the value of dc voltages for the device to operate properly.
the status of the diode.