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Homework Help: Dimensions of intensity

  1. Jan 17, 2014 #1
    1. The problem statement, all variables and given/known data
    I know that intensity is power per unit area. When I do a dimensional analysis, it reduces down to mass per cubic time. Is there any physical significance to that?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Jan 17, 2014 #2


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    Homework Helper

    Not really, because that form has removed all the geometry of the situation;
    Intensity's geometry comes from the energy flow vector piercing an Area, so a flow Volume is indicated.
    On the other hand, if you divide the intensity by flow velocity, you end with m v^2 / length^3 ;
    light's intensity divided by light speed leaves you with mc^2 / volume, the energy density in the light.
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