Plank’s Black Body Equation

German physicist Max Plank stated that energy is emitted in discrete units called quantum. Using Plank’s constant, h, he was able to relate the amount of energy of  wave or particle to its frequency using the following equation:

E=h υ

  • E= energy
  • h= Plank’s constant (h= 6.63 x 10 -34 J s)
  • υ = frequency

Example: When copper is bombarded with high-energy electrons, X rays are emitted.  Calculate the energy (in joules) associated with the photons if the wavelength of the X rays is 0.122 nm.



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