1.

Calculate the wavelength of radiation emitted by an LED made up of a semiconducting material with band gap energy 2.8eV.(a) 2.8 Å(b) 4.3308 Å(c) 5548.4 Å(d) 4430.8 Å

Answer» The correct option is (d) 4430.8 Å

For explanation: E = hc/ʎ

Therefore, ʎ = hc/E

ʎ = 4430.8 Å.


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