gc textbook chapter 11 Vibrations and Waves (id: 270a9a7d4)

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]
An earthquake P wave travelip09m .b+s u*qmkxu3q ang at k.0 km/s strikes a boundary wit*d89l7ouqt,zu p ict;*7h1oo 9phuku -o u-vmhin the Earth between two kinds of material. If it approaches the boundary at an incident angle of 47 *utu 9lqp7oo z1pu;vu -8 mh uo,*7kcih9dot-$^{\circ} $ and the angle of refraction is 35 $^{\circ} $, what is the speed in the second medium?    km/s

参考答案: 6.3±2%


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