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Homework Help: Beers Law and Colorimetry Problems

  1. Aug 26, 2014 #1
    1. The problem statement, all variables and given/known data
    1.http://puu.sh/b88pU/4f28d92240.png [Broken]
    2.http://puu.sh/b88rd/e93d067670.png [Broken]
    3. 73eda5cf2a.png
    4. 77c441fdd2.png

    2. Relevant equations

    3. The attempt at a solution
    1. I substituted x with 1.8 and got .751 then multiplied by 1000 to get 751 ohm but not sure if this process is entirely correct.
    2.no idea
    3.substituted 650 with y and then got 3.3 x 10^3, again not sure if right
    4. no idea
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Aug 27, 2014 #2


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    I completely miss any relevant equations...
  4. Aug 28, 2014 #3
    Thats the thing, Idk what even relates to this.
  5. Aug 31, 2014 #4


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    Idk is no good (see forum rules). What dyk ?
    Any idea how to google Beer's law? probably yes. Least you can do is make a guess as to how this can be migrated to your exercise.

    This screen dump comes from somewhere (and not from a sociology course). So there is a context.
    And you must have an idea what x and y are. So be so kind as to include that knowledge under 1.
    y must be some logarithm ? you substitute the 1.8 ppm for x. so the .195 is dimensionless too ? No way to get Volts per Ampere that way, right ?

    And so on. I like Question 7 also: none of the answers has the dimension of concentration.

    Could this be a Chemistry course ? Or am I not making friends that way ?
  6. Sep 3, 2014 #5
    Sorry yea its a chemistry question.

    I put it in the wrong section
  7. Sep 4, 2014 #6


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    No problem, Chemistry is physics as soon as you know what you are doing anyway. Now how about some context, etc?
  8. Sep 7, 2014 #7
    Its just some basic questions about beers law and a colorimetry lab.
  9. Sep 8, 2014 #8


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    Then there is no place for resistance. Either something is completely off, or you are ignoring the context. Our bet is that there was some introduction to these questions, describing what is the experiment.
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