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Question: If the energy of a photon of sodium light (\(\lambda =\) 589 nm) equals the band gap of semiconducto...

If the energy of a photon of sodium light (λ=\lambda = 589 nm) equals the band gap of semiconductor, the minimum energy required to create hole electron pair

A

1.1eV1.1eV

B

2.1eV2.1eV

C

3.2eV3.2eV

D

1.5eV1.5eV

Answer

2.1eV2.1eV

Explanation

Solution

: using, E=Eg=hcλE = E_{g} = \frac{hc}{\lambda}

}{= \frac{6.6 \times 10^{- 34} \times 3 \times 10^{8}}{589 \times 10^{- 9} \times 1.6 \times 10^{- 19}}eV = 2.1eV }$$