A) \[f'=f\]
B) \[f'=4f\]
C) \[f'=2f\]
D) \[f'=\frac{f}{2}\]
Correct Answer: A
Solution :
For fundamental frequency of vibration of air column \[l=\frac{\lambda }{2}\] \[\Rightarrow \] \[\lambda =2\,l\] Frequency, \[f=\frac{v}{\lambda }\] \[\Rightarrow \] \[f=\frac{v}{2\,l}\] ?. (i) When tube is placed inside water with half length immersed in water then \[\frac{l}{2}=\frac{\lambda '}{4}\] \[\lambda '=2\,l\] Frequency \[f'=\frac{v}{\lambda '}=\frac{v}{2l}\] ?.. (i) From Eqs. (i) and (ii), we get \[f'=f\]You need to login to perform this action.
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