List of top Physics Questions on Semiconductors asked in AP EAPCET

Doping a semiconductor with a trivalent impurity results in:

A solar cell has a light gathering area of \( 10\,\text{cm}^{2} \) and produces 0.2 A at 0.8 V (D.C.) when illuminated with sunlight of intensity \( 1000\,\text{Wm}^{-2} \). The efficiency of the solar cell is:

The minimum energy gap of a semi-conductor used in manufacturing LED is

A pure semiconductor crystal has \(8\times10^{28}\ \text{atoms m}^{-3}\). It is doped by \(2\ \text{ppm}\) concentration of pentavalent atoms. The number of holes formed in the semiconductor crystal is
\[ (\text{Intrinsic carrier concentration, } n_i=1\times10^{16}\ \text{m}^{-3}) \]

The correct statement of the following is

Consider the following statements:
Statement (A): The resistance of an ideal diode in forward biased condition is zero.
Statement (B): In a half wave rectifier, the load current flows only for every half cycle of the input signal.
Statement (C): In the breakdown region, a zener diode behaves as a constant voltage source.

Consider the statements in a semiconductor:
(A) There are no free electrons at \(0\;K\).
(B) There are no free electrons at any temperature.
(C) The number of free electrons increases with temperature.
(D) The number of free electrons is less than that in a conductor.