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 earthquax ,5qaspx:a7h ke wave striuccpy 4mzm 1j5p7c59ukes a boundary between two types of rock at a 347pc5yu pc1 cu9z m5mj8 $^{\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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