Physics - Sound Wave Question with Solution | TestHub

PhysicsSound WaveBeatsEasy2 minPYQ_2020

PhysicsEasysingle choice

Two stretched wires are in unison. If the tension in one of the wire is increased by 1%, 3 beats are produced in $2 s .$ The initial frequency of each wire is

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Answer:

Solution:

$n_{1} = k \sqrt{T}, n_{2} = k \sqrt{1.01 T}$

$∵ n_{2} - n_{1} = \frac{3}{2}$

$k (\sqrt{1.01 T} - \sqrt{T}) = 1.5$

$k \sqrt{T} [{(1 + 0.01)}^{\frac{1}{2}} - 1] = 1.5$

$k \sqrt{T} [1 + \frac{1}{2} \times 0.01 - 1] = 1.5$

$k \sqrt{T} = \frac{1.5 \times 2}{0.01}$

$= \frac{1.5 \times 2}{0.01}$

$= 300 H z$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Sound WaveSubtopic:Beats

⏱ 2mℹ️ Source: PYQ_2020

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