Electronic Devices Question 105
Question: The electron mobility in N-type germanium is 3900 cm2/v-s and its conductivity is 6.24 mho/cm, then impurity concentration will be if the effect of cotters is negligible
Options:
A) 1015 cm3
B) 1013 /cm3
C) 1012 /cm3
D) 1016 /cm3
Show Answer
Answer:
Correct Answer: D
Solution:
$ \sigma =en _{e}{\mu _{e}} $
Therefore $ n _{e}=\frac{\sigma }{e{\mu _{e}}}=\frac{6.24}{1.6\times {{10}^{-19\times 3900}}}=10^{16}/cm^{3} $
