Maths-

#### If then =

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- -1
- 1

#### Answer:The correct answer is: -1

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#### A long cylindrical tube carries a highly polished piston and has a side opening. A tuning fork of frequency n is sounded at the sound heard by the listener charges if the piston is moves in or out. At a particular position of the piston is moved through a distance of 9 cm, the intensity of sound becomes minimum, if the speed of sound is 360 m/s, the value of n is

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∴

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When piston moves a distance, path difference change by 2 xs.

the path difference between maxima and consecutive minima=

∴

Or

λ=4x=4×9 cm=36cm=0.36m

the path difference between maxima and consecutive minima=

∴

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