Answer :

Given:
Length of air column in the tube


Speed of sound in air



The frequency of the loudspeaker can be varied between 20 Hz to 2 KHz.


The resonance column apparatus is equivalent to a closed organ pipe.


Fundamental note of a closed organ pipe is given by:



So, the frequency of the other harmonics will be odd multiples of f:




According to the question, the harmonic should be between 20 Hz and 2 kHz.




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