Solveeit Logo
Login

Question

Physics Question on Semiconductor electronics: materials, devices and simple circuits

In germanium crystal, the. forbidden energy gap in joule is :

A

zero

B

1.6×10−191.6\times {{10}^{-19}}

C

1.1×10−191.1\times {{10}^{-19}}

D

1.76×10−191.76\times {{10}^{-19}}

Answer

1.1×10−191.1\times {{10}^{-19}}

Explanation

Solution

Semiconductors are similar to insulators but the conduction and valence bands are spaced closely,
so that at room temperature a number of electrons are found in conduction band.
For germanium, forbidden energy gap =0.67 eV= 0.67\, eV
=6.7×1.6×10−19J=6.7 \times 1.6 \times 10^{-19}J
=1.072×10−19J=1.072 \times 10^{-19}J
=1.1×10−19J=1.1 \times 10^{-19}J