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

Gujarat BoardEnglish MediumSTD 11 SciencePhysics14. waves and sound1 Mark
MCQ
Two travelling waves of equal amplitudes and equal frequencies move in opposite directions along a string. They interfere to produce a stationary wave whose equation is given by $y=\left(10 \cos \pi x \sin \frac{2 \pi t}{T}\right)\, cm$

The amplitude of the particle at $x =\frac{4}{3} \,cm$ will be........ $cm$.

  • A
    $4$
  • B
    $9$
  • C
    $6$
  • ✓
    $5$
✓

Answer

Correct option: D.
$5$
d
$10 \cos \left(\frac{4 \pi}{3}\right)$

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