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Which of the following is NOT an example of the downfall of classical
mechanics?
O existence of a threshold energy for ejection of an electron from a material
O observation of the "ultraviolet catastrophe" for blackbody radiators
O demonstration that light can be diffracted or polarized
O the existence of discrete emission lines in hydrogen emission spectra

Answer :

PSTNONSONJOKUIN

The phenomenon that does not depict the downfall of classical

mechanics is demonstration that light can be diffracted or polarized.

The major difference between classical and quantum mechanics lies in the their conception of energy. In classical mechanics, energy is continuous while in quantum mechanics, energy is quantized, that is, can only have discreet values.

The following observations depict the breakdown of classical mechanics;

  • existence of a threshold energy for ejection of an electron from a material
  • observation of the "ultraviolet catastrophe" for blackbody radiators
  • the existence of discrete emission lines in hydrogen emission spectra.

The demonstration that light can be diffracted or polarized does not in any way depict the downfall of classical  mechanics.

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