The electrical conductivity of a semiconductor of a semiconductor increases when electromagnetic radiation of wavelength shorter than 2480 nm, is incident on it. The band gap in (eV) for the semi conductor is ……

Options

A. 0.5 eV
B. 0.7 eV
C. 1.1 eV
D. 2.5 eV

Answer

A

Explanation

0.5 eV
Band gap energy `E_(g)=h_(f)`
`=(hc)/(lambda)`
`=(hc)/(lambda e)" " `(In eV)
`=(6.63xx10^(-34)xx3xx10^(8))/(2480xx10^(-9)xx1.6xx10^(-19))`
`=0.0050126xx10^(2)`
`~~0.5eV`