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Homework Help: Units of the Thermal de Broglie wavelength?

  1. Nov 27, 2013 #1
    1. Units of the Thermal de Broglie wavelength?

    2. λ = h / (2*pi*mkT)^(.5)

    3. through dimensional analysis i get S (J / kg)^.5

    can you even have .5 of a unit?
    Last edited by a moderator: Nov 27, 2013
  2. jcsd
  3. Nov 27, 2013 #2


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    Yes, you can have a quantity that has a dimension with a fractional exponent.

    However, here, you want to end up with just a unit of length.

    Try expressing a Joule in terms of kg, m, and s.
  4. Nov 30, 2013 #3
    Thank you will try that!

    and yes its a wavelength so should simply be in meters, what was i thinking, lol

    will do the dimensional to confirm anyway, thanks!
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