In a resonance tube the first resonance with a tuning fork occurs at 16 cm and second at 49 cm. If the velocity of sound is 330 m/s, the frequency of tuning fork is 

(1) 500

(2) 300

(3) 330

(4) 165

(1) For closed pipe l1=v4n;

l2=3v4nv=2n(l2l1)

n=v2(l2l1)=3302×(0.490.16)=500Hz

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