Question

A photodiode of GaAs has wavelength of $0.74\mu m$. Calculate the band gap energy in eV at given wavelength

• A. 1.67
• B. 3.67
• C. 0.67
• D. 2.67

Answer 1

The correct option is A 1.67

$energy\left(eV\right)=\frac{hv}{e}=\frac{hc}{\lambda e}=\frac{6.6224\times {10}^{-34}\times 3\times {10}^8}{0.74\mu m\times 1.6\times {10}^{-19}}$

$=16.784\times {10}^{-1}$

$=1.6784\left(eV\right)$