For a certain organ pipe, three successive resonance frequencies are observed at $425,595,$ and $765 \,Hz$ respectively, Taking the speed of sound in air to be $340 \,m / s$ the fundamental frequency of the pipe (in $Hz$ ) is .........
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(c)
Frequencies are $425,595,765$.
Among the options the $HCF$ is here $85$.
Since resonant frequencies are odd multiples of fundamental frequency.
The fundamental frequency is $85 \,Hz$.
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