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what are the units of cm divided by a cm-1 watch

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    what would happen would it be just -1
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    \dfrac{x}{x^{-1}} = x(x^{-1})^{-1} = \dddot
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    It would be a cm^2 because you're dividing cm by 1/cm, which is just cm x cm.
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    (Original post by GGYSM)
    It would be a cm^2 because you're dividing cm by 1/cm, which is just cm x cm.
    This is the right answer OP


    (Original post by alow)
    \dfrac{x}{x^{-1}} = x(x^{-1})^{-1} = \dddot
    That gives 1/x^2 which is wrong
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    (Original post by ChaoticButterfly)
    \dfrac{x}{x^{-1}} = x(x^{-1})^{-1} = \dddot


    That gives 1/x^2 which is wrong
    Really? Surely the last part comes to x, so then multiplying it by the first part gives x^2. It looks like it gives the same answer as the one which you have identified as correct.
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    (Original post by Pangol)
    Really? Surely the last part comes to x, so then multiplying it by the first part gives x^2. It looks like it gives the same answer as the one which you have identified as correct.
    I did it on some paper

    Yep you are right.... I've spent to long out in the real world and my algebra has gone to **** :-/

    I added the two -1 powers instead of multiplying. Although even then I still got the wrong answer doing that lol, should have been 1/x. Would have got zero marks for my working out.
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    (Original post by ChaoticButterfly)
    I did it on some paper

    Yep you are right.... I've spent to long out in the real world and my algebra has gone to **** :-/

    I added the two -1 powers instead of multiplying. Although even then I still the wrong answer doing that lol, should have been 1/x
    Hey, happens to us all from time to time...
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    wait so whats the answer
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    (Original post by Loop hoop)
    wait so whats the answer
    (Original post by GGYSM)
    It would be a cm^2 because you're dividing cm by 1/cm, which is just cm x cm.
    ..
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    (Original post by Loop hoop)
    wait so whats the answer
    cm^2 (centimeter squared)
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    Is your question pertaining to spectroscopy? Infra red spectroscopy maybe?

    The x axis of the spectrum is wavenumber, i.e. the number of waves per unit length. Usually this is measured in the unit cm-1, the reciprocal of the wavelength of the IR radiation being used.
 
 
 
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