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The equation of a wave travelling on a s...

The equation of a wave travelling on a string is given by Y(mn) = 8 sin[`(5m^(-1)x-(4s^(-1)t`]. Then

A

velocity of wave is 0.8 m/s

B

the displacement of a particle of the sting at t= 0 and `x = (pi)/(30)` m from the mean position is 4 mn

C

the displacement of th mean position at t = 0, `x = (pi)/(30)`m is 8 m/s

D

velocity of the wave is 8 m/s

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