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Q.

The forbidden energy gap in a semi conductor is 2.0 eV then what is the wavelength of light required to excite an electron from valence band to conduction band

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a

$4800 A^{0}$

b

$6400 A^{0}$

c

$6600 A^{0}$

d

$6200 A^{0}$

answer is D.

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Detailed Solution

$λ = \frac{12400 (e V . \overset{0}{A})}{△ E_{g}} = \frac{12400}{2} = 6200 \overset{0}{A}$

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