A) 40 Hz
B) 10 Hz
C) 20 Hz
D) 30 Hz
Correct Answer: C
Solution :
[c] Two successive frequencies of closed pipe |
\[\frac{nv}{4l}=220\] (i) |
\[\frac{(n+2)}{4l}=260\] (ii) |
Dividing (ii) by (i), we get |
\[\frac{n+2}{n}=\frac{260}{220}=\frac{13}{11}\] |
\[11n+22=13n\] |
\[n=11\] |
So, \[11\frac{v}{4l}=220\] \[\frac{v}{4l}=20\] |
So fundamental frequency is 20 Hz. |
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