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A wave pulse is generated in a string th...

A wave pulse is generated in a string that lies along x-axis. At the points A and B, as shown in figure, if
`R_A and R_B`
are ratio of wave speed to the particle speed respectively then :

A

in same time

B

time difference is T 14 (B is lagging)

C

time difference is T / 2 (B is lagging)

D

time difference is T / 4 (A is lagging)

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