Wave motionHardBloom L3
Question
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.
Options
A.vP is upwards
B.vQ = – vR
C.| vP | > | vQ | = | vR |
D.vQ = vR
Solution
Sol.
VQ = VR
$\because\left\lbrack \cos( - \theta) = \cos\theta \right\rbrack$
Vp> VQ [speed max. at y = 0]
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