A) 13.5 cm
B) 2.7 cm
C) 5.4 cm
D) 10.3 cm
Correct Answer: A
Solution :
\[n\propto \frac{1}{l}\Rightarrow \frac{{{l}_{2}}}{{{l}_{1}}}=\frac{{{n}_{1}}}{{{n}_{2}}}\Rightarrow {{l}_{2}}={{l}_{1}}\left( \frac{{{n}_{1}}}{{{n}_{2}}} \right)\]\[=50\times \frac{270}{1000}\]\[=13.5cm\]
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