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Question

The y-x curve at an instant for a wave travelling along x axis on a string is shown. Slope at the point A on the curve, as shown, as shown, is 53. Select the correct statement(s).

A
Transverse velocity of the particle at point A is positive if the wave is travelling along positive x axis.
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B
Transverse velocity of the particle at point A is positive if the wave is travelling along negative x axis of the particle at point A.
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C
Magnitude of transverse velocity of the particle at point A is greater than wave speed.
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D
Magnitude of transverse velocity of the particle at point A is lesser than wave speed.
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Solution

The correct options are
B Transverse velocity of the particle at point A is positive if the wave is travelling along negative x axis of the particle at point A.
C Magnitude of transverse velocity of the particle at point A is greater than wave speed.
As shown in the curve, if wave is moving along -x axis, VA is positive because as the peak shifts left all particles on left move upward.

VAVW=tanθ
|tanθ|>1 VA>VW

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