A) 12.5 cm
B) 8 cm
C) 13.2 cm
D) 16 cm
Correct Answer: C
Solution :
For closed organ pipe, third harmonic \[\text{=}\frac{3v}{4l}\] For open organ pipe, fundamental frequency \[=\frac{v}{2l'}\] Given, \[\frac{3v}{4l}=\frac{v}{2l'}\] \[\Rightarrow l'=\frac{4l}{3\times 2}=\frac{2l}{3}\] \[=\frac{2\times 20}{3}=13.33cm\]You need to login to perform this action.
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