The equation y = y₀sin(wt -kx) describes a travelling wave.

In this case: k = 2p/l = 2p/0.5 = 4p rad/m

v = fl or f = v/l = 340/0.5 = 680 Hz

w = 2pf = 2p680 = 1360p rad/s

Equation is: y = y₀sin(1360p - 4px)