Q. The energy gap of silicon is 1.14 eV. At what wavelength the silicon will stop to absorb the photon?
A) 10877 $\mathring{\mathrm{A}}$
B) 9888 $\mathring{\mathrm{A}}$
C) 1087.7 $\mathring{\mathrm{A}}$
D) 1000 $\mathring{\mathrm{A}}$
Explanation
(a) We know that,
$E = hv = \frac{hc}{\lambda}$
$\Rightarrow = \frac{hc}{E}$
$\lambda = \frac{{6.6 \times 10}^{- 34} \times {3 \times 10}^{8}}{{1.14 \times 1.6 \times 10}^{- 19}}$
$\lambda = \ $10877 $\mathring{\mathrm{A}}$.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.