The electrical conductivity of a semiconductor increases when electromagnatic radiation of wavelength shorter than 2480 nm is incident on it. The band gap (in eV) for the semiconductor is `[hc=1242 eV nm]`

Options

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

Answer

C

Explanation

As `lambda_(max)=2480nm, :. Band gap E_(g)=(hc)/lambda_(max)`
`:. E_(g)=(1242 eV nm)/(2480 nm)~~0.5 eV`