Suppose the energy liberated in the in the recombination of a hole-electron pair is converted into electromagnetic radiation.If the maximum wavelength emmited is 820nm,What is the band gap?

Options

A. 0.5 e V
B. 2.5 e V
C. 1.5 e V
D. 15 e V

Answer

C

Explanation

Give `lambda = 820mn`
`E = (hc)/(lambda) = (1242/(820)( eV-nm)/nm`
` = 1.5eV`