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# Return of the Pea Checker: You found that the original Pee Checker 9000 hydration meter from Homework 1 suffered from an unfortunate aw: corrosion...

please solve 1-6 of the attached photos. greatly appreciate it, thank you !

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Return of the Pea Checker: You found that the original Pee Checker 9000 hydration meter
from Homework 1 suffered from an unfortunate ﬁaw: corrosion destroys the electrodes in the
urine sample chamber aﬂer only a few uses. You decide to design the new and improved Fae
checker sun, which measures the concentration cfthe urine optically, not electrically. The Pee Checker 9001 measures the concentration of urobilin {or umchrom a], the source of
the yellow color of mine when you are dehydrated, the urobilin is less diluted with water and
your urine looks more yellow; when you are hydrated the urobilin is more diluted with water and your urine loo ks less yellow. By measuring how much light is absorbed by a sample, and applying Beefs Law, we can
determine the concentration of urobilin in the sample and, therefore, assess the user‘s
hydration. 1. [20 points] If urobilin solutions {and urine] loolr yellow, what is a wavelength ofyisible light that
a urobilin solutions probably transmits {doesn’t absorb strongly]? And what is a wavelength of
yisible light that a urobilin solution probably absorbs ldoesnft transmit strongly)? Hint: here‘s absorption spectra for four colors of food coloring: 1. [20 points} Draw a possible schematic ofthe Pee Checker 9001 [not an electric circuit, but a
schematic ofthe different parts assembled in a way that will perform the described absorption
measurementl. For full credit, be as specific as possible. Don‘t get into the math of correlating absorbance with concentration [that’s question 33.

3 I'ED poinlsl For liyltat amle'lglh that tl'e umbilin soluu'un absorbs mm, the molar
ahsarm'rmmr msbilin : - 1mm&quot; cm“ mmmm Mi: rmmror mnlesﬂiuerJ. Wi'iuea
n1ad’lernatil:alei:pre5innforthe Doncarlu'ation afurnbilin asa ﬁncdunohhe absorba'lceof
the Lrine andthe dimensions Dimesa'nple chamber'lmu cles'gned in Question 1. Time lorlieldsesti Igl ‘fnutake the PeeChecloer 9001 tatheUCRtrack and have 10 &quot;mars
west their urine with the instrument. The runners also hm hired drawn and analyzed for waner DUIDEMJ this pmvides the gold sum dimis of dehydration. Here are your results: A :23 points] Caltulate the follcm' lg for the Pee Checker 9001:
Positive predictive value:
Neptive predictive value;
Sensitivity: Spetiﬁciw: 5 :10 points] Based on this data. is the Pee Checker 90:11 better suited For: M one] El Hamming del'wdmion
El ruling cut de'wdration 6 l10puin111Llse BayE' Theorem mann‘ﬁrm the posi'ﬂveptedlmvevduewu calculated in
Question 3. lintsahre BayE Theorernfnrtl'epmhdﬂwﬂmwhrre dd'lyslrated. gunman anmmmrﬁaMEdWherﬁlsokmas
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