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Say you have a cord where the first half is made of one material and the...

Say you have a cord where the first half is made of one material and the second half is made of another. If you send a wave down the cord along the first half, when it hits the transition point, there is a reflected wave that comes back in your direction. If that reflected wave is inverted, does the transmitted wave have a longer or shorter wavelength? Explain.

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