Question

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

• A. $1.1eV$
• B. $2.1eV$
• C. $3.2eV$
• D. $1.5eV$

Answer 1

Answer: (B)

$2.1eV$

Answer 2

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

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