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Physics - Wave on String Question with Solution | TestHub

PhysicsWave on StringMiscellaneousEasy2 minPYQ_2020

PhysicsEasysingle choice

A string $2.0 m$ long and fixed at its ends is driven by a $240 H z$ vibrator. The string vibrates in its third harmonic mode. The speed of the wave and its fundamental frequency is

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Answer:

Solution:

For a string fixed at both the ends,
$f = \frac{n}{2 L} v$
For third harmonic, $240 = \frac{3}{2 (2)} v$
$\Rightarrow v = \frac{240 \times 4}{3}$
$= 320 m s^{- 1}$
Fundamental frequency $f_{0} = \frac{1}{2 L} v$
$= \frac{1}{4} \times 320 = 80 H z$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Wave on StringSubtopic:Miscellaneous

⏱ 2mℹ️ Source: PYQ_2020

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