Question

Energy gap of silicon is 1.14 ev .Find the maximum wavelength at which silicon starts energy absorption

Answer 1

use the formula, $\bf{E=\frac{hc}{\lambda}}$

where E is energy, h is plank's constant ,$\lambda$ is wavelength and c is the speed of light.

if E is in form of eV and $\lambda$ is in form of angstrom

then use formula, $\lambda=\frac{12400}{E}$

here, E = 1.14 eV

so, $\lambda=\frac{12400}{1.14}$

= 10877 Å

hence, maximum wavelength at which silicon starts energy adsorption= 10877 Å