Need help with a question, probably quick to answer

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The question involves calculating the speed of a wave pulse in Geological Layer 2 after it travels through Geological Layer 1 at a speed of 1800 m/s. The angles of incidence and refraction are provided, with the wave entering Layer 1 at 37 degrees and exiting into Layer 2 at 15 degrees. This suggests that Layer 2 is denser than Layer 1, affecting the wave speed. Snell's Law of refraction is applicable here, which relates the angles and speeds in the two layers. To find the speed in Layer 2, the equation derived from Snell's Law can be used, incorporating the known speeds and angles.
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Ok so I am completely lost for this question =/ It's a 5 page paper and this is answer is needed to complete several others.

Homework Statement


A Thumper Truck sends a wave pulse traveling at a speed of 1800 ms-1 through Geological Layer 1.
Using the data from the diagram below calculate the speed of the wave in Geological layer 2.


Homework Equations


The diagram shows two mediums (geological layer 1 and 2) with the normal line going through them at a right angle. The wave at its point when it goes through layer 1 is at 37 degrees to the normal and when it reaches layer 2 it decreases to 15 degrees to the normal. Does this mean that layer 2 is denser? and if so in what equation would you use the angles given and the speed to determine the speed of the wave pulse in layer 2?

Thanks =]


The Attempt at a Solution

 
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Look up Snell's law of refraction, which describes how waves bend when passing into a medium with a different wave speed.
 

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