Question

The intensity of radiation from a human body is maximum around a certain wavelength. A
photon of this wavelength can just excite an electron from the valence to the conduction band
of a semiconductor used in a night vision device. Assume that the black body radiation law
holds for the human body. The band gap of such a semiconductor is close to
(A) 0.1 eV (B) 0.5 eV (C) 1.0 eV (D) 2.0 eV

Answer 1

(C) 1.0 eV 
is the answer for your question