A) \[195Hz\]
B) \[251Hz\]
C) \[150Hz\]
D) \[300Hz\]
Correct Answer: A
Solution :
[a] \[{{\text{L}}_{\text{1}}}\text{=0}\text{.95m,}\,\,{{\text{L}}_{\text{2}}}\text{=1m}\] |
\[{{\text{L}}_{2}}>{{L}_{1}},{{n}_{1}}>N>{{n}_{2}}\] |
\[{{n}_{1}}-N=5andN-{{n}_{2}}=5\] |
On solving \[{{n}_{1}}-{{n}_{2}}=10\] |
\[{{n}_{2}}={{n}_{1}}-10\] |
By law of length of vibrating string |
\[{{n}_{1}}{{L}_{1}}={{n}_{2}}{{L}_{2}}\] |
On solving we get\[{{n}_{1}}=200Hz\] |
\[{{n}_{1}}-N=5\] |
\[N=195Hz\] |
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