Saturday, February 17, 2018

electromagnetism - What is the minimum wavelength of electromagnetic radiation?


As a first approximation, I don't see how a wavelength of less than 2 Planck distances could exist. The question is: Are there any other limits that would come into play before that?


For example:



  • Would the energy density cause the photon to turn into a black hole or something like that?

  • Would the energy of the photon exceed the total mass+energy of the universe?




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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

I am studying Statics and saw that: The moment of a force about a given axis (or Torque) is defined by the equation: $M_X = (\vec r \times \...