A) \[3\mu m\]
B) \[0.3\mu m\]
C) \[1\mu m\]
D) \[1\,\,m\]
Correct Answer: A
Solution :
\[\frac{{{\lambda }_{2}}}{{{\lambda }_{1}}}=\frac{{{T}_{1}}}{{{T}_{2}}}\Rightarrow {{\lambda }_{2}}=\frac{{{T}_{1}}}{{{T}_{2}}}\times {{\lambda }_{1}}=\frac{900}{1200}\times 4=3\mu m\]
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