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If the equation of a travelling wave is ...

If the equation of a travelling wave is given as `y = 40 cos (1600t + 6x)`, (where `y` is in millimeter, `t` is in second and `x` is in meter), then ratio of the wave speed to the maximum particle speed will be

A

`10 : 3`

B

`6 : 25`

C

`25 : 6`

D

`3 : 10`

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