Question: Q. 11. Give reason for the following :
(i) High reverse voltage does not appear across a LED.
(ii) Sunlight is not always required for the working of a solar cell.
(iii) The electric field, of the junction of a Zener diode, is very high even for a small reverse bias voltage of about
U] [Delhi Comptt. 2016]
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Solution:
Ans. (i) It is because reverse break down voltage of LED is very low i.e., nearly
(ii) Because solar cell can work with any light whose photon energy is more than the band gap energy.
(iii) The heavy doping of
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