The equation of a wave traveling on a string is given by y=8sin[(5m−1)x−(4s−1)t] . Then

Given y=8sin[(5m−1)x−(4s−1)t] …(1) Wave equation y=Asin(kt−ωx)...(2) Compare (1) & (2)ω=4 s−1   k=5 s−1 We know ϑ=ωk=45=0.8 Position at t=0   x=π30 m y=8sin[5(π30)−4(0)] y=8sinπ6 y=8×12 y=4m