In a resonance tube, using a tuning fork of frequency 325 Hz, two successive resonance lengths are observed at 25. 4 cm and 77 . 4 cm respectively. Thevelocity of sound in air is
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a
338 ms-1
b
328 m s-1
c
330 m s-1
d
320 m s -1
answer is A.
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Detailed Solution
l1 +x=λ/4 and l2 + x=3λ4 where x is the end correction . l2âl1=λ2 or λ=2l2âl1 or λ=2(77â 4â25â 4) λ=104cm V=nλ=325Ã104=33800cm/s=338m/s