A) 12
B) 18
C) 24
D) 30
Correct Answer: B
Solution :
\[{{n}_{1}}{{\lambda }_{1}}={{n}_{2}}{{\lambda }_{2}}\Rightarrow {{n}_{2}}={{n}_{1}}\times \frac{{{\lambda }_{1}}}{{{\lambda }_{2}}}=12\times \frac{600}{400}=18\]
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