One formula for a wave with a *y* displacement (e.g., of a string) traveling in the *x* direction is

y(x,t) = A sin (kx - ωt).

All the questions in this problem refer to this formula and to the wave it describes.

a) What is the phase *ϕ* (x,t) of the wave?

b) What is the wavelength λ of the wave?

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