Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

RD Thought Experement (wikiversity article)

  1. Oct 26, 2009 #1
    Last edited by a moderator: Apr 24, 2017
  2. jcsd
  3. Nov 2, 2009 #2
    Re: RD Thought Experiment (wikiversity article)

    Not even wrong?

    -- Dmtr.
    // 124F2501. You've just been split.
    Last edited: Nov 2, 2009
  4. Nov 2, 2009 #3
    First of all:
    The path of a photon is not dictated because of some "law of increasing entropy". It's the other way around -- increasing entropy follows from (the statistical averaging of) the dynamics of the photon and the rest of the system (or any other system under consideration). You cannot say that a photon _has_ to choose a path or else the entropy doesn't increase. It simply doesn't work that way.

    Why on earth would the path of a photon depend on the state /system/ ... of the endpoint of one both paths? Not even wrong indeed.

    As for the experiment: the photon choosing the upper path will cause a larger increase in entropy than the lower one. So what? Both paths still cause an increasing entropy, although the lower one causes less. But there is no law of "this event causes more entropy gain, therefore it has to happen more often".

    A statement like that just shows you want your answer and reasoning to be true, while you present hardly any proof to support such a "logical statement".
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook