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# An earthquake P wave traveling at 7.7km/s strikes a boundary within the Earth between two kinds...

An earthquake P wave traveling at 7.7km/s strikes a boundary within the Earth between two kinds of material.

If it approaches the boundary at an incident angle of 44? and the angle of refraction is 33?, what is the speed in the second medium?

Express your answer to two significant figures and include the appropriate units.

## Solutions

##### Expert Solution

we have

sin i /sinr = v1/v2

v2 = v1 sin r/sini

v2 = 7.7 (sin33/sin44) km/s

v2 = 6.04km/s

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