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Physics - Sound Wave Question with Solution | TestHub

PhysicsSound WaveWavesMedium2 minQB

PhysicsMediuminteger

A fork and a monochord string 100 cm long give 4 beats per second. The string is made shorter without any change of tension until it is in unison with the fork. If its length is now 99 cm, what is the frequency of the fork? (answer in $Hz$ ).

Answer:

400

Solution:

$f_{100} = f_{99} \times \frac{99}{100}$ and the fork equals $f_{99}$ . Beats: $f_{99} - f_{100} = \frac{f _{99}}{100} = 4$ , so the fork is 400 Hz.

Stream:JEESubject:PhysicsTopic:Sound WaveSubtopic:Waves

⏱ 2mℹ️ Source: QB

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