name: name redacted\nhandwriting unit study guide\nturn in on test day for extra credit\n1. terms:\n| vocab…

name: name redacted\nhandwriting unit study guide\nturn in on test day for extra credit\n1. terms:\n| vocab word | look up the definition from google or from class notes/activities | explain in your own words (7 words or less) |\n| \graphology\ vs. \forensic document analysis\ | | |\n| forensic science | | |\n| chromatography | | |\n| rf value | | |\n2. describe what happened in the lindbergh baby case\n3. describe what happened in the anthrax letter case\n4. if a pigment from an ink pen travels 25mm and the solvent travels 40mm, what is the rf value? (show your work)\n5. if a pigment from an ink pen travels 13mm and the solvent travels 39mm, what is the rf value? (show your work)\n6. are the pigments from questions 4 and 5 likely to be a match? why or why not?\n7. how are the following people connected to the cases we covered in class?\na. charles lindbergh jr.\nb. charles lindbergh sr.\nc. tom daschle

name: name redacted\nhandwriting unit study guide\nturn in on test day for extra credit\n1. terms:\n| vocab word | look up the definition from google or from class notes/activities | explain in your own words (7 words or less) |\n| \graphology\ vs. \forensic document analysis\ | | |\n| forensic science | | |\n| chromatography | | |\n| rf value | | |\n2. describe what happened in the lindbergh baby case\n3. describe what happened in the anthrax letter case\n4. if a pigment from an ink pen travels 25mm and the solvent travels 40mm, what is the rf value? (show your work)\n5. if a pigment from an ink pen travels 13mm and the solvent travels 39mm, what is the rf value? (show your work)\n6. are the pigments from questions 4 and 5 likely to be a match? why or why not?\n7. how are the following people connected to the cases we covered in class?\na. charles lindbergh jr.\nb. charles lindbergh sr.\nc. tom daschle

Answer

Explanation:

Step1: Recall Rf - value formula

The formula for the Rf (retention - factor) value is $Rf=\frac{\text{distance traveled by pigment}}{\text{distance traveled by solvent}}$.

Step2: Calculate Rf value for question 4

Given that the distance traveled by the pigment is $25$mm and the distance traveled by the solvent is $40$mm. Using the formula, $Rf_1=\frac{25}{40}= 0.625$.

Step3: Calculate Rf value for question 5

Given that the distance traveled by the pigment is $13$mm and the distance traveled by the solvent is $39$mm. Using the formula, $Rf_2=\frac{13}{39}=\frac{1}{3}\approx0.333$.

Step4: Compare Rf values for question 6

Since $Rf_1 = 0.625$ and $Rf_2=0.333$, and Rf values are unique for a particular pigment - solvent combination under the same conditions, the pigments are not likely a match because their Rf values are different.

Answer:

  1. $Rf = 0.625$
  2. $Rf=\frac{1}{3}\approx0.333$
  3. No, different Rf values.