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Physics - Sound Wave Question with Solution | TestHub

PhysicsSound WaveStanding waveHard2 minPYQ_2018

PhysicsHardsingle choice

The fundamental frequency in an open organ pipe is equal to the third harmonic of closed organ pipe. If the length of the closed organ pipe is 20 cm, the length of the open organ pipe isNEET 2018

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Answer:

Solution:

For closed organ pipe, third harmonic $\frac{3 v}{4 l_{cop}}$
For open organ pipe, fundamental frequency $\frac{v}{2 l_{oop}}$ .
According to question

$f_{o o p} = 3 f_{c o p}$

$\Rightarrow \frac{v}{2 l_{o o p}} = \frac{3 v}{4 l_{c o p}}$

$l_{o o p} = \frac{2}{3} \times l_{c o p} = \frac{2}{3} \times 20 \approx 13.2 c m$

Stream:NEETSubject:PhysicsTopic:Sound WaveSubtopic:Standing wave

⏱ 2mℹ️ Source: PYQ_2018

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