What changes when a wave move from 1 string to another.

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When a wave transitions from one string to another with different linear densities, its frequency remains constant, while the wavelength changes. The change in wavelength occurs due to the differing speeds of the wave in each string, which is influenced by the linear density. If the wave is traveling through two connected strings, the frequency at the boundary remains the same as the incoming wave. However, the wave speed will differ, resulting in a longer or shorter wavelength in the second string. Understanding these relationships is crucial for analyzing wave behavior across different media.
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I want to know if wave length or frequency will change when a wave move from a string of a certain linear density to another of a different linear density?
 
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When you say it moves to the other string, do you mean vibrations in the second arising because of the movement of the first? Or are you merely replacing one string with another and applying the same stimulus?
 
I mean two strings are attached or 1 string with varying density. The wave then travel from one part to another.
 
OK, so it's a traveling wave. That means some source is generating the wave at one end. Where the wave hits the boundary, what will the frequency be at that point? How will that relate to the frequency each side?
 

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