The diagram below shows an instataneous position of a string as a transverse progressive wave travels along it from left to rightWhich one of the following correctly shows the direction of the velocity of the points 1, 2 and 3 on the string
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a
1- → ; 2- → ; 3- →
b
1- ← ; 2- ← ; 3- ←
c
1- ↑ ; 2- ↓ ; 3- ↑
d
1- ↓ ; 2- ↑ ; 3- ↓
answer is D.
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Detailed Solution
Particle velocity Vp =-(wave speed)(slope)Slope at ‘1’ is positive,Vp at ‘1’ is negative slope at ‘2’ is negative Vp at ‘2’ is positiveSo, ‘1’ is moving downwards and ‘2’ is moving upwards. ‘3’ is moving downwards