Question: A longitudinal earthquake wave strikes a boundary between two types of rock at a 38o angle. As the wave crosses the boundary, the specific gravity

A longitudinal earthquake wave strikes a boundary between two types of rock at a 38o 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.

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