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Units of plancks law in terms of wavelength

  1. Jan 17, 2015 #1
    The dimensional term in Planck's law (after getting rid of steradians) is

    [itex]\frac{h c^2}{\lambda^5}[\itex]

    Which seems to yield units of J*m/s. However, Wikipedia suggests that the units are J/(m3*s). If wikipedia is right, how do you get that answer?
  2. jcsd
  3. Jan 17, 2015 #2


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    Staff: Mentor

    How did you get J*m/s? There is a length to the 5th power in the denominator.

    (the closing tag is [/itex])
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