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Physics - Sound Wave Question with Solution | TestHub

PhysicsSound Wave302Hard2 minQB

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Passage / Comprehension

A cylindrical block of density 2 gm/cc is suspended by a thin wire 3m long. When the wire is vibrated, it produces fundamental frequency of 280 Hz. The mass of wire is so small that tension in the wire can be assumed to be constant. Now the block is dipped in a liquid. It is found that the first overtone now is 280 Hz.\\

If the block is dipped to 1/3 of it's height in the liquid, what is the new fundamental frequency?

Options:

Answer:

Solution:

$\frac{f ^{'}}{f} = 1 - \frac{ρ _{L}}{3 ρ} = 1 - \frac{1.5}{6} = \frac{3}{2}$

$f^{'} = 280 \times \frac{3}{2} = 1403 Hz$

Answer (C)

Stream:JEESubject:PhysicsTopic:Sound WaveSubtopic:302

⏱ 2mℹ️ Source: QB

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