A) \[172220\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[172.2\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[17222\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[1722\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: C
Solution :
Energy gap. \[{{E}_{g}}=\frac{hc}{\lambda }\] \[\lambda =\frac{hc}{{{E}_{g}}}=\frac{12400}{0.72}=17222\overset{o}{\mathop{A}}\,\]
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