Electronic Devices Question 142
Question: In a PN junction photo cell, the value of photo-electromotive force produced by monochromatic light is proportional to
[CBSE PMT 2004]
Options:
A) The voltage applied at the PN junction
B) The barrier voltage at the PN junction
C) The intensity of the light falling on the cell
D) The frequency of the light falling on the cell
Show Answer
Answer:
Correct Answer: C
Solution:
When a light (wavelength sufficient to break the covalent bond) falls on the junction, new hole electron pairs are created.
No.
of produced electron hole pair deponed upon no.
of photons.
So photo emf or current proportional to intensity of light.
