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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
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Correct option is A
From figure, First harmonic is obtained at l=λ4=50 cmThird harmonic is obtained for resonance,l'=3λ4=3×50=150 cm
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A cylindrical tube, open at both ends has fundamental frequency ‘f’ in air. The tube is dipped vertically in water so that half of it is in water. The fundamental frequency of the air column is now
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