Making knowledge exciting: Spectrum Physics is a modular learning and working book designed for students in lower secondary education. Through a variety of illustrative everyday examples, written in clear and simple language, this compendium conveys the fundamentals of modern physics. Practical - diverse - flexible. Thanks to its methodological openness, Spectrum Physics serves as both a reference book and a textbook, as well as a source of inspiration and guidance for independent content development. A wide range of tasks and examples are complemented by detailed descriptions of the theoretical guidelines. For teachers, this means maximum freedom in designing their lessons. They can easily switch between the two profile requirements of textbook and workbook and relate them to each other as needed. Flexibility is key.