M Dash Foundation: C Cube Learning

Category: Relativity

  • A Photon has no mass. It can’t rest.

    A Photon has no mass. It can’t rest.

    A) A Photon has no mass. B) A implies “It can’t rest”. C) Therefore it doesn’t have rest mass. D) Photon rest mass is zero. Assertion and reasoning; A is correct. B is correct and follows from A. C is correct, it does follow from B. But D is incorrect it does not follow from…

  • Waves, particles and Einstein !

    Waves, particles and Einstein !

    Waves are something that have no mass and move at the maximum speed, mass m = 0. speed c = 1. So whats their momentum? p = m.v = 0? Right? No. For pure waves; momentum does not come from mass. It comes only from motion. (pure wave; they do not have mass) For matter…

  • What happens when cows move rapidly !

    What happens when cows move rapidly !

    Cows not moving and moving fast. How does this difference impact the image in a modern digital camera? Honestly I haven’t checked it with old day manual camera neither do I remember what impact motion brings into mages taken by such, eg does anyone remember when he/she took a picture of a friend standing in…

  • Why is the helicity for a mass-less particle Lorentz invariant?

    Result; now that photons are mass-less, their energy, momentum, speed, etc are no more variables, in the sense of arbitrariness. They are constants, taking only a few values, but constant in a given situation. But other particles have these properties; arbitrary. So electrons energy and momentum are not fixed, but arbitrary. But as long as…

  • A particle that defies classical mechanics !

    A photon has no mass but energy and it has speed and it has momentum although it does not have mass. Thats impossible in Classical Mechanics. Because Classical Mechanics associates with every mass; momentum and kinetic and potential energy. All those would be zero if mass were to be zero. Also the speed of the…