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Physics - Sound Wave Question with Solution | TestHub

PhysicsSound WaveBeatsEasy2 minPYQ_2020

PhysicsEasysingle choice

A tuning fork of frequency $200 Hz$ is in unison with a sonometer wire. Tension in the wire of sonometer is increased by $1 %$ without any change in its length. Find the number of beats heard in $9 s$ .

Options:

Answer:

Solution:

$f = \frac{1}{2 π} \sqrt{\frac{T}{μ}}$

$\frac{∆ f}{f} = \frac{1}{2} \frac{∆T}{T}$

$∆ f = \frac{1}{2} \times \frac{1}{100} \times 200$

$∆ f = 1$

Beat frequency = 1

Number of beats in 9 second $= 9 \times 1 = 9$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Sound WaveSubtopic:Beats

⏱ 2mℹ️ Source: PYQ_2020

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