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Homework Help: Graph Frequency vs Distance

  1. Sep 16, 2007 #1
    Alright, I have Physics homework where I have to graph Frequency vs Distance(I think it was distance). Well there are 3 columns, Frequency, Distance(As I said I think) than 1/Frequency. How in the world do you figure out 1/Frequency? I know that Frequency is Hz, and Hz = 1/s. So I would suppose 1/Frequency would be something like this?

    Frequency Distance 1/Frequency

    1 1/1/s
    2 1/2/s
    3 1/3/s
    4 1/4/s
    5 1/5/s
    6 1/6/s
    7 1/7/s
    8 1/8/s

    If so, what does s(Seconds) become?
  2. jcsd
  3. Sep 16, 2007 #2


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    [tex] \frac{1}{s^{-1}} = s [/tex]
  4. Sep 16, 2007 #3
    I understand that 1/s = s, I mean my teacher gave me a gigantic formula going, Hz=1/s=1/1/s=1/s/s=s/s/s=s/s=s.... But I still don't know what the heck I am doing. :( Sorry.

    Also I just found out this morning that Distance is Wavelength(cm). I still don't know how to find it though.
    Last edited: Sep 17, 2007
  5. Sep 17, 2007 #4
    Any ideas?
  6. Sep 17, 2007 #5


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    I'm really confused as to what you're asking! You have a table with data in the three columns and you are asked to plot frequency vs. wavelength?
  7. Sep 17, 2007 #6
    I'm asked to plot Wavelength v. 1/Frequency. But I have no clue on how to get the 1/Frequency Column. Right now my table looks like this.

    (Hz)--------------(cm)---------------( )
  8. Sep 17, 2007 #7


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    Oh, right. Well, it's just the reciprocal of the first column. So, it would look like


    (which I now see is what you put in your first post!)

    Now, the units of frequency are [tex]s^{-1}=\frac{1}{s}[/tex] so the units of 1/freq will be [tex]\frac{1}{1/s}[/tex]. What does this equal?
    Last edited: Sep 17, 2007
  9. Sep 17, 2007 #8
    Alright thats kind of what I thought in the beginning. So mostly it would just be,


    and NOT


  10. Sep 17, 2007 #9


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    This is correct

    If you actually look at these numbers, they are the reciprocal of 1/freq, i.e. they are frequency (1/(1/2)=2). I think your teacher probably confused you. He may well have been discussing the units for 1/freq (since 1/(1/s)=s)
  11. Sep 17, 2007 #10
    Alright thanks alot for your help. Definitely.
  12. Sep 17, 2007 #11
    Alright so also if I am graphing, would I use .5(1/2), .33(1/3), .25(1/4) or what?
  13. Sep 17, 2007 #12


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    Yes, you will plot the points at 1/2(=0.5), 1/3(=0.33), etc.
  14. Sep 17, 2007 #13
    Alright thanks a lot. The only problem I had was graphing because I accidently put the changing value as the y and not the x. Now what should this become as a line when its graphed? Straight, Linear, or Squared?
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