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GaAs (with a band gap =`1.5eV`) as an LED can emit

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GaAs (with a band gap =`1.5eV`) as an LED can emit
A. blue light
B. infrared rays
C. ultraviolet rays
D. `X`-rays
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1 Answer

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Correct Answer - B
`lambda=(1242)/(1.5)=828nm`, infrared rays
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