First slide

Classification of Metals, semiconductors and insulators

Question

The energy gap of silicon is 1.14 eV. The maximum wavelength at which silicon will begin absorbing energy is

Easy

A

10888 $\overset{o}{A}$
B

1088.8 $\overset{o}{A}$
C

108.88 $\overset{o}{A}$
D

10.888 $\overset{o}{A}$

Solution

$λ_{\max} = \frac{hc}{E} = \frac{6.6 x 10^{- 34} x 3 x 10^{8}}{1.14 X 1.6 X 10^{- 19}} = 10888 \overset{o}{A}$

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