Inverse square law .intensity-brightness-luminosity-distance

  1. Inverse square law.....intensity-brightness-luminosity-distance

    can anyone help me answer this question please
    recall the inverse square law of intensity of light and use it to relate the brightness of a star to its luminosity and distance from an observer.
  2. jcsd
  3. HallsofIvy

    HallsofIvy 41,260
    Staff Emeritus
    Science Advisor

    I would recommend three things: first look up the "inverse square law" and write it down. Second, look up the definition of "brightness". Third, look up the definition of "luminosity".

    Now think carefully about the difference between "brightness" and "luminosity" of a stand and put those three things together.
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