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Questions  >>  JEEMAIN and NEET  >>  NEET PAST PAPERS  >>  2017
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Q)

The two nearest harmonics of a tube closed at one end and open at other end are 220 Hz and 260 Hz. What is the fundamental frequency of the system ?


( A ) 40 Hz
( B ) 30 Hz
( C ) 10 Hz
( D ) 20 Hz
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