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Resonance in RLC Circuit

The band gap ...

Question

The band gap in $eV$ of a semiconductor material required to construct an LED that emits peak power at the wavelength of $620 nm$ is

$(Plank constant h = 4.13567 \times 10^{- 15} eVs$ $and speed of light c = 2.998 \times 10^{8} m/s)$
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Solution

The correct option is A 2
$E_{g} = \frac{h c}{λ} = \frac{4.13567 \times 10^{- 15} \times 2.998 \times 10^{8}}{620 \times 10^{- 9}}$
$= 2 eV$

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