1.

In a resonance-column experiment to measure the velocity of sound, the first resonance is obtained at a length l1 and the second resonance at a length l2. Then, (a) l2 > 3l1 (b) l2 = 3l1(c) l2 < 3l1 (d) may be any of the above, depending on the frequency of the tuning fork used

Answer»

Correct Answer is: (c) l2 < 3l1

λ = wavelength of sound, δ = end correction

l1 = λ/4 + δ

l2 = 3λ/4 + δ

or l2 = (l1 - δ) + δ = 3l1 - 2d.

∴ l2 < 3l1.



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