Q.
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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a
150cm
b
200cm
c
66.7cm
d
100cm
answer is A.
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Detailed Solution
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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