If the energy of a photon of sodium light (λ=580 nm ) equals the band gap of semiconductor, the minimum energy required to create hole electron pair.

Question

If the energy of a photon of sodium light (λ=580 nm ) equals the band gap of semiconductor, the minimum energy required to create hole electron pair. (A) 1.5 eV (B) 3.2 eV (C) 2.1 eV (D) 4.1 eV

Tardigrade Admin · Accepted Answer

Using E=Eg=(h c/λ)=(6.6 × 10-34 × 3 × 108/580 × 10-9) J =(6.6 × 10-34 × 3 × 108/580 × 10-9 × 1.6 × 10-19) eV =2.1 eV

Q. If the energy of a photon of sodium light $(λ = 580 nm)$ equals the band gap of semiconductor, the minimum energy required to create hole electron pair.

$1.5 e V$

$3.2 e V$

$2.1 e V$

$4.1 e V$

Using $E = E_{g} = \frac{h c}{λ} = \frac{6.6 \times 1 0 ^{- 34} \times 3 \times 1 0 ^{8}}{580 \times 1 0 ^{- 9}} J$
$= \frac{6.6 \times 1 0 ^{- 34} \times 3 \times 1 0 ^{8}}{580 \times 1 0 ^{- 9} \times 1.6 \times 1 0 ^{- 19}} e V = 2.1 e V$

Q. If the energy of a photon of sodium light (λ=580nm) equals the band gap of semiconductor, the minimum energy required to create hole electron pair.

1.5eV

3.2eV

2.1eV

4.1eV