A) 40 Hz
B) 10 Hz
C) 20 Hz
D) 30 Hz
Correct Answer: C
Solution :
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.You need to login to perform this action.
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