Standing Wave Lab has error pointed out by Laura Goldberg. The relationship is between lambda and sqrt of [FT/(M/L)] NOT square of [FT/(M/L)].
Molly Hahn dropped me a note about correcting the solution to number 5 . She pointed out that the square root of (6.4 E10/2.5E3) is 5059 m/s and this is the correct answer for the wave speed. Therefore the correct answer for the wavelength is 10.2 m and for the wave speed in the second material is 7133 m/s. Sorry, I calculated the orignal speed for Y =6.4E11 N/m^2 for some unknown reason.
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