A) \[\text{28}00\overset{\circ }{\mathop{\text{A}}}\,\]
B) \[3150\overset{\circ }{\mathop{\text{A}}}\,\]
C) \[4000\overset{\circ }{\mathop{\text{A}}}\,\]
D) \[5600\overset{\circ }{\mathop{\text{A}}}\,\]
Correct Answer: B
Solution :
\[_{a}{{\mu }_{w}}=\frac{{{\lambda }_{air}}}{{{\lambda }_{water}}}\] \[\Rightarrow \] \[\frac{4}{3}=\frac{4200}{{{\lambda }_{water}}}\] \[\therefore \] \[{{\lambda }_{water}}=4200\times \frac{3}{4}\] \[\mathbf{=3150}\,\,\mathbf{{\AA}}\]
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