A wave y = a sin (omegat - kx) on a stri...

A wave `y = a sin (omegat - kx)` on a string meets with another wave producing a node at `x = 0`. Then the equation of the unknown wave is

`y = a sin(omega t + kx)`

`y = -a sin(omega t +kx)`

`y = a sin (omega t - kx)`

`y = -a sin (omega t - kx)`

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