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Calculate the wavelength of radiation emitted by an LED made up of a semiconducting material with band gap energy 2.8eV.

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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

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This intriguing question originated from Laser topic in division Laser of Engineering Physics II

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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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