The right part of the string has mass \mu_r per unit length and the left part of the string has mass \mu_l per unit length. If a wave of unit amplitude travels along the left part of the string, what is the amplitude of the wave that is transmitted to the right part of the string?
- 1
- \dfrac{2}{1+\sqrt{\mu_l / \mu_r}}
- \dfrac{2\sqrt{\mu_l / \mu_r}}{1+\sqrt{\mu_l / \mu_r}}
- \dfrac{\sqrt{\mu_l / \mu_r}-1}{\sqrt{\mu_l / \mu_r}+1}
- 0
Solution :
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Good call on evaluating limiting cases. I just wanted to add that the transmission/reflection coefficient formulas are applicable to every 1-D wave equation (or normal incidence in 3-D) in all the different fields of study. I just had the result memorized for EM propagation from materials of different permittivity, which is analogous to mass per unit length.
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