GENERAL KNOWLEDGE

Detailed explanation-1: -Classical or Newtonian mechanics were unable to explain phenomena such as black body radiation, photoelectric effect, and the temperature dependence of a substance’s heat capacity.

Detailed explanation-2: -The alpha decay of polonium-212 releases the most important quantity of energy, 8.95 MeV. This decay would be forbidden by classical mechanics : it would be impossible for an alpha particle to go from inside the nucleus in A to outside in B.

Detailed explanation-3: -The incident and scattered beams should have same wavelength and frequency. But in Compton effect intensity peaks are present at two wavelengths. Hence the classical theory cannot explain the Compton effect.

Detailed explanation-4: -Rutherford’s model could not explain this phenomenon because if a charged particle is in motion, it radiates energy which can cause it to collapse to the nucleus making it unstable. Rutherford’s model could not explain the stability of the atom.