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Physics - Sound Wave Question with Solution | TestHub

PhysicsSound WaveBeatsEasy2 minPYQ_2020

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An unknown tuning fork when sounded together with a tuning fork of frequency $256 Hz$ emits two beats. On loading the tuning fork of frequency $256 Hz$ , the number of beats heard is $1$ per second. The frequency (in $Hz$ ) of the unknown tuning fork is

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Answer:

Solution:

$n_{A} =$ Known frequency $= 256 Hz$ , $n_{B} = ?$
$x = 2 bps$ , which is decreasing after loading $(i . e . x ↓)$
Known tuning fork is loaded so $n_{A} ↓$
Hence $n_{A} ↓ - n_{B} = x ↓$ .....(i) Correct
$n_{B} - n_{A} ↓ = x ↓$ .....(ii) Wrong
$\Rightarrow$ $n_{B} = n_{A} - x = 256 - 2 = 254 Hz$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Sound WaveSubtopic:Beats

⏱ 2mℹ️ Source: PYQ_2020

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