A) 31 cm
B) 45 cm
C) 46 cm
D) 47 cm
Correct Answer: D
Solution :
\[\frac{\lambda }{4}={{l}_{1}}+e\]and\[\frac{3\lambda }{4}={{l}_{2}}+e\] \[\Rightarrow \] \[\frac{{{l}_{2}}+e}{{{l}_{1}}+e}=3\] \[\Rightarrow \] \[{{l}_{2}}=3{{l}_{1}}+2e\] \[=3\times 15+2\times 1.0\] \[=47\text{ }cm\]You need to login to perform this action.
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