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14. waves and sound — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics14. waves and sound1 Mark
MCQ
Progressive wave of sound is represented by $y = a\sin [400\pi \,t - \pi x/6.85]$ where $x$ is in $m$ and $t$ is in sec. Frequency of the wave will be .... $Hz$
  • ✓
    $200$
  • B
    $400$
  • C
    $500 $
  • D
    $600$
✓

Answer

Correct option: A.
$200$
a
(a) $n = \frac{\omega }{{2\pi }} = \frac{{400\pi }}{{2\pi }} = 200\,\,Hz$ (As $\omega  = 400 \pi $)

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