A) 1 : 30
B) 30 : 1
C) 42 : 14
D) 14 : 42
Correct Answer: B
Solution :
\[\frac{{{T}_{1}}}{{{T}_{2}}}=\frac{{{\lambda }_{{{m}_{2}}}}}{{{\lambda }_{{{m}_{1}}}}}=\frac{4200}{140}=\frac{30}{1}\]
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