Question

Find the wavelength of light that may excite an electron in the valence band of diamond to the conduction band. The energy gap is $5.50eV$

• A. 226 nm
• B. 312 nm
• C. 432 nm
• D. 550 nm

Answer 1

Answer: (A)

226 nm

Answer 2

: Energy gap, $E_{g} = \frac{hc}{\lambda}$ $$\lambda = \frac{hc}{E_{g}}$$

Here, energy gap$= 5.50eV$

Take $hc = 1240eVnm$

$\therefore\lambda = \frac{1240eVnm}{5.5eV} = 226nm$