First slide
Standing waves

An air column, closed at one end and open at the other, resonates with a tuning fork when the smallest length of the column is 50cm. The next larger length of the column resonating with the same tuning fork is


From figure, First harmonic is obtained at


l=λ4=50 cm

Third harmonic is obtained for resonance,

l'=3λ4=3×50=150 cm


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