Electronic Devices and Circuits - Engineering

Q1:

In a specimen of n type semiconductor, the initial concentration of holes and electrons is pno and nno. When the specimen is subjected to radiation, the hole and electron concentration increase to pn and nn. Then

A pn - pno = nn - nno

B pn + pno = nn + nno

C pn - pno = nno + nno

D pn + pno = nn - pno

ANS:A - pn - pno = nn - nno

Since the specimen is subjected to radiation, recombination occurs leading to decrease in concentration.