The textbook "Spectrum Physics 9th/10th Grade" is aimed at students in Lower Saxony and provides a comprehensive introduction to the physical fundamentals covered in the curriculum for grades 9 and 10. The content is didactically prepared and promotes understanding of physical concepts through illustrative examples and practical applications. The authors, including Karl Sarnow and Jens Gössing, have designed the book to be suitable for both classroom instruction and independent learning. The clear structure and understandable language help learners grasp and apply complex topics. The book is a valuable resource for school education and contributes to the promotion of scientific education.