The equation of standing wave in a stret...

The equation of standing wave in a stretched string is given by `{y =2sin [pi /2 (x)] cos(20 pi t)}` where x and y are in meter and t is in second. Then minimum separation between two particle which are at the antinodes and having same phase will be

A

2 m

B

6 m

C

3 m

D

4 m

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