question_answer

The  electrical  conductivity  of  a semiconductor     increases     when electromagnetic radiation of wavelength shorter than 2480 nm, is incident on it. The bandgap for the semiconductor is     AIEEE  Solved  Paper-2005

A) 1.1 eV

B)                                        2.5 eV  

C)                        0.5 eV  

D)                        0.7 eV

Correct Answer: C

Solution :

The band energy gap is \[{{E}_{g}}=h\,v\]