Q.
In a resonance tube experiment to determine the speed of sound in air, a pipe of diameter 5 cm is used. The air column in pipe resonates with a tuning fork of frequency 480 Hz when the minimum length of air column is 16 cm. The speed of sound in air at room temperature is
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a
300 m/s
b
336 m/s
c
340 m/ s
d
360 m /s
answer is B.
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Detailed Solution
We know that end correction = 0.6 r, where r is radius of resonance tube. The equivalent length is given byL= L + 0.6 rthe situation is shown in fig. (10 ) From figure, L′=λ/4 or λ=4L′ Now V=nλ=n4L′ or V=480[4(l+0⋅6r)] V=480[4(0⋅16+0⋅6×0⋅025)] =336m/s
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