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.
Diffcult
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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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