This physics problem tests your understanding of fundamental physical laws and their applications. The step-by-step solution below breaks down the problem using relevant equations and physical reasoning.

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Step 1: Identify the general form of a progressive wave equation and compare it with the given equation. The general equation for a progressive wave moving in the positive x-direction is: The given wave equation is: By comparing these two equations, we can see that the term representing the phase constant due to position is . This term represents the phase difference from the origin at a given position .
Step 2: Convert the given phase difference from degrees to radians. The problem states that the phase difference is . To use this in the equation, we must convert it to radians:
Step 3: Equate the phase constant from the equation to the given phase difference. The phase constant in the wave equation is . We are given that this phase difference is radians.
Step 4: Solve for . To solve for , we can multiply both sides of the equation by 4: Then, divide both sides by :
Step 5: State the units. The options are given in cm, so the value of is .
The final answer is .
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This physics problem tests your understanding of fundamental physical laws and their applications. The step-by-step solution below breaks down the problem using relevant equations and physical reasoning.