Max Planck's solution to the problem:

• Treat a blackbody as being made up of a whole bunch of oscillating atoms, with the energy of each oscillating atom being quantized.
  
  
• The energy of the atoms could only take on the following discrete values:
  E = nhf (n = 0, 1, 2, 3 ...)
  where f is the frequency and n is an integer.
  
  
• Planck's constant: h = 6.634 x 10^-34 J s