A p type semiconductor has acceptor levels 57 meV above the valance band. The maximum wavelength of light required to create hole is (Planck constant $\mathrm{h}=6.6 \times 10^{-34} \mathrm{Js}$ )

Question

A p type semiconductor has acceptor levels 57 meV above the valance band. The maximum wavelength of light required to create hole is (Planck constant $\mathrm{h}=6.6 \times 10^{-34} \mathrm{Js}$ ), $11.61 \times 10^{-33} Å$, $217105 Å$, $57 \times 10^{-3} Å$, $57 Å$

MARKS App · Accepted Answer

Given: $\begin{aligned} & \mathrm{E}=57 \mathrm{meV}=57 \times 10^{-3} \times 1.6 \times 10^{-19} \mathrm{~J} \ & \mathrm{E}=\frac{\mathrm{hc}}{\lambda} \ & \lambda=\frac{\mathrm{hc}}{\mathrm{E}}=\frac{6.6 \times 10^{-34} \times 3 \times 10^8}{57 \times 1.6 \times 10^{-22}} \ & \lambda=\frac{6.6 \times 3 \times 10^{-26}}{57 \times 1.6 \times 10^{-22}} \ & \lambda=0.2171052 \times 10^{-4} \mathrm{~m} \ & \lambda=217105.2 \times 10^{-10} \mathrm{~m} \ & \lambda=217105 Å \text { (Approx.) } \end{aligned}$

Search any question & find its solution

Looking for more such questions to practice?