A cylindrical tube (L = 120, cm.) is resonant with a tuning fork of frequency 330, Hz . If it i

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14.Waves and Sound

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A cylindrical tube $(L = 120\, cm.)$ is resonant with a tuning fork of frequency $330\, Hz$. If it is filling by water then to get resonance again, minimum length of water column is ...... $cm$ $(v_{air} = 330\, m/s)$

A

$45$

B

$60$

C

$25$

D

$20$

Solution

$n = \frac{{xv}}{{4l}} \Rightarrow 330 = \frac{{x \times 330}}{{4l}}$

$l=\frac{1}{4}=\frac{1}{4} \frac{3.5}{4}$

Minimum water $=120-75=45 \mathrm{\,cm}$

Standard 11

Physics

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