Physics FAQ Physics Forums FAQ

  1. ZapperZ

    ZapperZ 29,644
    Staff Emeritus
    Science Advisor
    Gold Member

    This forum contains simple responses to the most frequently-asked questions in the Physics sub-forums. It is a continually evolving thread, and more FAQ's will be added.

    For more in-depth coverage of Physics FAQ's, refer to

    http://math.ucr.edu/home/baez/physics/

    Please PM me all questions, comments, corrections, etc.

    Zz.

    .

    List of questions covered in this FAQ:

    .

    Light, Photons, and Relativity

    Is light a wave or a particle?

    Do Photons Move Slower in a Solid Medium?

    Do photons have mass?
    (Includes: But photons have energy. By E = mc2, doesn't this mean that they have a mass?)

    If photons don't have mass, why do their paths "bend" in a gravitational field?

    I've read that in relativity the concept of the rest frame of a photon doesn't make sense. Why is that?

    .

    Quantum Physics (Excluding Light and Photons)

    Why don't electrons crash into the nucleus in atoms?

    Does the Heisenberg Uncertainty Principle imply energy nonconservation?

    .

    Thermodynamics

    What is Heat?
    (Includes definitions of internal energy, work, and heat)

    .

    Classical (or Newtonian) Mechanics

    Why is acceleration due to gravity a constant?
     
    Last edited by a moderator: Jul 1, 2011
  2. jcsd
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