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  • The electrical conductivity of a semiconductor increases when electromagnetic radiation of wave length shorter than <img alt="2480 \mathrm{~nm}" src="https://entrancecorner.oncodecogs.com/gif.latex

The electrical conductivity of a semiconductor increases when electromagnetic radiation of wave length shorter than 2480 \mathrm{~nm} is incident on it. The band gap (in cv) for the semiconductor is -

 

Option: 1

0.9
 


Option: 2

0.7


Option: 3

0.5

 


Option: 4

1.1


Answers (1)

best_answer

\begin{aligned} & \mathrm{ \lambda_{\min }=2480 ~nm=24800~ \AA } \\ & \mathrm{\text { Energy (in~eV) }=\frac{12375}{\lambda}(in~ \AA) }\\ &\mathrm{ E=\frac{12375}{24800} ev, E \approx 0.5 eV}\\ \end{aligned}

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Deependra Verma

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