What is the formula for determining wavelength in different mediums?

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proskier
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Please help!

In my physics, I need to find the wavelengths of the waves from a source in a different medium.

In the first medium, my angle of incidence is 35 degrees and with a speed of 150m/s and a frequency of 75Hz. In the different medium the speed has dropped to 96m/s. I know the angle of refraction will be smaller. But how do I figure that out as well as the frequency in order to determine the wavelength?
 
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i guess what i really want to know is if frequency changes as it crosses a medium,