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Questions  >>  JEEMAIN and NEET  >>  NEET PAST PAPERS  >>  2017
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The two nearest harmonics of a tube closed at one end are open at other end are 220 Hz and 260 Hz .What is the fundamental frequency of the system ? end

$\begin{array}{1 1} (1) 10 \;Hz \\ (2) 20 \;Hz \\ (3) 30\; Hz \\ (4) 40\; Hz \end{array} $

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