1.

The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is 20 cm, the length of the open organ pipe isA. `13.2 cm`B. `8 cm`C. `12.5 cm`D. `16 cm`

Answer» Correct Answer - B
Fundamental frequency of open organ pipe `f_0=(v)/(2l_1)`
third harmonic of a closed organ pipe `f_3=(3v)/(4l_2)`
It is given `f_0=f_3`
`(v)/(2l_1)=(3v)/(4l_2)`
or `I_1=(2)/(3)l_2=(40)/(3)cm=13.3cm`


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