Question

The electrical conductivity of a semi conductor increases when electronmagnetic radiation of wave length shorter than 2480 nm is incident on it. The band gap (in eV) for semiconductor is

• A. $0.9$
• B. $0.7$
• C. $0.5$
• D. $1.1$

Answer 1

Answer: (C)

$0.5$

Answer 2

: $E_{g} = \frac{hc}{\lambda} = \frac{1240eVnm}{2480nm} = 0.5eV$