gc textbook chapter 11 Vibrations and Waves (id: c1cd03af8)

本题目来源于试卷: gc textbook chapter 11 Vibrations and Waves，类别为 通用国际物理

[填空题]
A longitudinal earthquake wave stvr zw/ /8h5tqmrikes a boundary between two types ofs j;:vl 2kyqw4 rock at a ls2jy ;4vkqw :38 $^{\circ} $ angle. As the wave crosses the boundary, the specific gravity of the rock changes from 3.6 to 2.8. Assuming that the elastic modulus is the same for both types of rock, determine the angle of refraction.    $^{\circ} $

参考答案: 44±2%


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