A) \[3600\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[2400\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[1800\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[1200\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: C
Solution :
\[W=\frac{hc}{\lambda }\] where\[h\]is plancks constant, \[c\]is speed of light,\[\lambda \]is wavelength \[\lambda =\frac{hc}{W}=\frac{6.6\times {{10}^{-34}}\times 3\times {{10}^{8}}}{6.825\times 1.6\times {{10}^{-19}}}\] \[\lambda =1800\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
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