**a) **

Independent variables are defined as those variables that are freely varied to control the value of the wave equation.

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).

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

a) Which are independent variables?

b) Which are parameters that determine the characteristics of the wave?

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