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

Gujarat BoardEnglish MediumSTD 11 SciencePhysics14. waves and sound1 Mark
MCQ
At a certain moment, the photograph of a string on which a harmonic wave is travelling to the right is shown. Then, which of the following is true regarding the velocities of the points $P, Q$ and $R$ on the string.
  • A
    $v_P$ is upwards
  • B
    $v_Q = v_R$ 
  • C
    $| v_P | > | v_Q | = | v_R |$
  • ✓
    both $(B)$ and $(C)$
✓

Answer

Correct option: D.
both $(B)$ and $(C)$
d
since both $Q$ and $R$ are at equal distance from $Y$ axis slopes have equal magnitudes here and are negative, so $v_{Q}=v_{R}$

At point $P$ slope is greater as compared to point $Q$ and $R$. Hence magnitude of velocity at point $P$ is greater than that at point $Q$ and $R$

Slope at point $Q$ and $R$ are equal. Hence particle velocities have same magnitude and same direction,

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