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In Quick's Tube the sound intensity being detected changes from max to min for 2nd time, when the slidable tube is drawn apart by 9.0 cm. If speed of air 336 m/s, then frequency of their sounding source

  • Option 1)

    2.8 kHz

  • Option 2)

    2.3 kHz

  • Option 3)

    2 kHz

  • Option 4)

    1 kHz

 

Answers (1)

best_answer

Total path diff=\frac{\lambda }{2}+\lambda =\frac{3\lambda }{2}

\frac{3\lambda }{2}=18cm

\lambda =12cm

f=\frac{v}{\lambda }=\frac{336}{12\times 10^{-2}}=2.8KHz

 

Quinck's tube -

This is an apparatus used to demonstrate the phenomena of interferance and also used to measure velocity of sound in air.

- wherein

x= \frac{\lambda }{2}

V=2\nu _{0}x

\nu _{0}= frequency

 

 


Option 1)

2.8 kHz

This is correct

Option 2)

2.3 kHz

This is incorrect

Option 3)

2 kHz

This is incorrect

Option 4)

1 kHz

This is incorrect

Posted by

divya.saini

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