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

`10 : 3`

`6 : 25`

`25 : 6`

`3 : 10`

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