Wave energy : Amplitude or Frequency?

[unleash500]

So for sound, and other wave phenomena , it seems that the energy it carries is related to its amplitude.

For quantum levels we get the equation E=hf.
What is going on here?

Does the amplitude not matter in terms of energy for quantum waves?

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[UMICHPremed]

For classical mechanics (i.e. sound waves, ocean waves), energy is proportional to square of amplitude.

However, for quantum mechanics, the energy of monochromatic waves is equal to hf.

 

[Phantastic]

Does the amplitude not matter in terms of energy for quantum waves?

It's more indicative of the intensity, I believe.