To find the equation of the sinusoidal wave, we need to determine several properties of the wave:

Wave Velocity (v):

Given that the wave travels a distance of 1.2 cm in 0.3 seconds, the velocity can be computed as:

Wave Number (k):

The wave number kis calculated using the wavelength :

Angular Frequency ( ):

Angular frequency is related to the wave number and velocity by the equation , thus:

Wave Equation:
The general form for a sinusoidal wave traveling in the positive x -direction is:

Given the maximum displacement (amplitude A) of the wave is 2 cm, the equation becomes:

This equation accurately describes the sinusoidal wave given the provided parameters.