Final answer:
The phenomenon observed in a quantization of energy lab report is Energy levels quantization (option D), which can be deduced from the discrete lines in atomic spectra. Additionally, a key part of understanding this quantization is the photoelectric effect, which demonstrated that EM radiation is made of quanta called photons.
Step-by-step explanation:
In a quantization of energy lab report, the phenomenon observed is D) Energy levels quantization. This can be identified by the specific lines in atomic spectra, which are the electromagnetic (EM) emissions produced by individual atoms and molecules. These lines indicate that the energy levels within an atom are not continuous, but rather come in discrete amounts, or 'quanta'.
From the context of your lab report, and the listed sections from your textbook, it seems like you're studying the sections pertaining to quantum mechanics and the behaviors of light and matter at a quantum level. Specifically, a central concept in your lab report is related to Einstein's explanation of the photoelectric effect, where light behaves quite unexpectedly: not as a wave, but as a particle. Einstein showed that the EM radiation must be quantized into units we now call photons. Each photon carries a quantum of energy proportional to its frequency, as shown by the equation E = hv.