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14.Waves and Sound
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કણનું સ્થાનાંતર $x = 3 \,sin \,(5\pi \,t) \,+ \,4 \,cos \,(5\pi \,t) \,cm$ હોય, તો કણનો કંપવિસ્તાર કેટલો થાય?

A

$3$

B

$4$

C

$5$

D

$7$

Solution

$x = a\, sin  \omega\,  t + b\, cos  \omega \,t$

$x\, = \,\sqrt {{a^2}\, + \,{b^2}\,} \sin \,\left( {\omega \,t\, + \,{{\tan }^{ – 1}}\left( {b/a} \right)} \right)$

$x\, = 3\,\sin \,\left( {5\pi \,t} \right) + 4\cos (5\pi \,t)$

$x\, = \,\sqrt {9 + 16} \,\sin \,\left( {5\,\pi \,t\, + \,{{\tan }^{\, – 1}}4/3} \right)$

$x\, = \,5\,\sin (\,5\pi \,t\, + \,{\tan ^{ – 1}}(4/3))$

Standard 11
Physics

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