Yes, there are several systems in classical mechanics (CM) where energy quantization is predicted. One example is the quantization of energy in a simple harmonic oscillator. In this system, the energy levels are discrete and can only take on certain values, known as quantized energy levels. This is due to the fact that the potential energy in the oscillator is proportional to the square of the displacement from equilibrium, leading to equidistant energy levels.
Another example is the quantization of energy in a particle in a one-dimensional box. In this system, the particle is confined to a finite region and can only exist at certain energy levels, determined by the size of the box. This is due to the wave-like nature of the particle, where only certain wavelengths are allowed within the box, leading to quantized energy levels.
Furthermore, the quantization of energy is also observed in the hydrogen atom in CM. In this system, the electron is confined to specific energy levels around the nucleus, which are determined by the principal quantum number n. This quantization of energy is a result of the electron's wave-like behavior and the Coulomb potential between the electron and the nucleus.
In summary, energy quantization is a fundamental concept in CM and is observed in various systems, such as the simple harmonic oscillator, a particle in a one-dimensional box, and the hydrogen atom. These systems demonstrate the discrete and quantized nature of energy in classical mechanics, which has significant implications in understanding the behavior of matter at the atomic and subatomic level.