This book proposes a bold hypothesis: the universe, across microscopic, mesoscopic, and macroscopic scales, adheres to a consistent fundamental law, with frequency ($f$) and quantization as its manifestations. Classical physics describes the mesoscopic world with Newtonian mechanics and electromagnetism, emphasizing causality and deterministic trajectories; at the macroscopic scale, general relativity unveils spacetime's geometric laws; in the microcosm, quantum mechanics reigns with probability and wave functions. Yet, these descriptions should not be disjoint. A unified law should explain planetary orbits, electron wave functions, and photon frequencies ($f$). Planck's $\Delta E = hf$ first linked energy quantization to frequency, hinting at cross-scale universality; de Broglie's matter-wave hypothesis blurred the particle-wave divide; quantum field theory casts particles as field excitations, with ($f$) as a vibrational property. These discoveries suggest ($f$) is not merely a technical parameter but a clue to a unified cosmic law. However, quantum mechanics' statistical nature and intrinsic property definitions obstruct a complete understanding of this law. Statistical methods satisfy us with predictions, neglecting the physical origin of ($f$); the intrinsic label renders its origin unquestionable. This book challenges this status quo, tracing ($f$)'s history, experimental significance, and theoretical evolution to uncover its deeper mechanisms. We will ask: what is the root of quantization? Why does energy quantize in units of ($hf$), not continuously? If mesoscopic causal mechanisms cannot directly explain the microcosmic ($f$), is it because we have yet to discover the bridge connecting them? This book takes frequency ($f$) as its guiding thread, leading readers through the historical, theoretical, and philosophical labyrinth of quantum mechanics. Part I retraces ($f$)'s genesis, from Planck's blackbody radiation to de Broglie and Schrödinger's wave hypotheses, revealing how ($f$) became quantum mechanics' cornerstone. Part II dissects ($f$)'s theoretical dilemmas, critiquing the compromises of statistical methods, exploring the controversy of intrinsic properties, and examining why mesoscopic laws struggle to explain microscopic phenomena. Part III turns to alternative interpretations (e.g., Bohmian mechanics) and modern theories (e.g., quantum field theory), seeking clues to ($f$)'s origin and the mechanisms of quantization. Part IV looks to the future, through quantum gravity and string theory, envisioning how a unified law might explain ($f$) and the essence of quantization. Throughout this journey, we return to core questions: where does ($f$) come from? Is it the rhythm of a unified cosmic law? Is quantum mechanics' statistical nature the truth of reality or a compromise of human cognition? Can the mechanism of quantization reveal nature's deeper structure? Through these inquiries, we not only explore quantum mechanics' mysteries but also reflect on the boundaries of science and the limits of human understanding. Let us follow the rhythm of ($f$) and embark on this quest for the truth of the cosmos.
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