The diagram below shows an instantaneous position of a string as a transverse progressive wave travels along it from left to right.
Which one of the following correctly shows the direction of the velocity of the points $1, 2$ and $3$ on the string
Medium
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(d) Particle velocity $({v_p}) = - \,v \times $ Slope of the graph at that point
At point $1$ : Slope of the curve is positive, hence particle velocity is negative or downward ($\downarrow$)
At point $2$ : Slope negative, hence particle velocity is positive or upwards ($\uparrow$)
At point $3$ : Again slope of the curve is positive, hence particle velocity is negative or downward ($\downarrow$)
At point $1$ : Slope of the curve is positive, hence particle velocity is negative or downward ($\downarrow$)
At point $2$ : Slope negative, hence particle velocity is positive or upwards ($\uparrow$)
At point $3$ : Again slope of the curve is positive, hence particle velocity is negative or downward ($\downarrow$)
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