The Physics of the Solid . Physics of the Core. Nuclear reactions: methodical instructions for practical classes and homework on disciplines: "B" by A. P. Kashchenko is a valuable textbook for students and teachers studying physics at an in-depth level. This work is not just a collection of methodological guidelines, but also a real guide to the complex world of physics, covering both fundamental aspects and modern achievements in the field of solid state and nuclear physics. The book begins with the basics of solid state physics, where the author readily explains key concepts such as crystal lattices, material properties, and interactions between atoms. These topics are fundamental to understanding more complex phenomena, such as the electrical and magnetic properties of solids. Kashchenko does not just list the facts, but immerses the reader in the world of physics, focusing on the practical application of the theory. This is especially important for students who are striving not only for theoretical knowledge, but also for their application in real-world tasks. Next, the author moves on to nuclear physics, where the basic principles of nuclear reaction, the structure of the atomic nucleus and the interaction between nucleons are considered. This part of the book will be interesting not only for students, but also for those who are fond of nuclear physics, since Kashchenko shares current data on modern research in this area. He emphasizes the importance of nuclear physics in areas such as energy, medicine and even space research, which makes the material particularly relevant in light of modern scientific advances. The book also includes guidelines for practical classes and homework, making it an indispensable tool for teachers. These guidelines will help students not only better absorb the material, but also develop critical thinking and scientific analysis skills. Kashchenko offers a variety of tasks that contribute to a deep understanding of the topics and help develop the practical skills necessary for the successful study of physics. For whom is this book intended? First of all, it will be useful for students of physical, mathematical and engineering specialties, as well as teachers who are looking for high-quality teaching materials for their classes . The age category of readers varies from high school students preparing for admission to the university, to graduate students engaged in in-depth study of physics. The book will be interesting to those who are just interested in science and want to expand their knowledge in the field of physics. The topics raised in the book, such as the interaction of matter at the atomic level, the properties of solids and nuclear reactions, are not only relevant, but also extremely important for understanding modern scientific research. Kashchenko shows how theoretical knowledge can be applied in practice, which makes his work especially valuable for future scientists and engineers. Style A. P. Kashchenko is distinguished by clarity and accessibility, which allows the reader to easily assimilate even the most complex concepts. His other well-known works are also devoted to physics and teaching methods, which confirms his status as an expert in this field. The Physics of the Solid . Physics of the Core. Nuclear Reactions” will be an excellent addition to the library of everyone who seeks a deep understanding of physics and its application in various spheres of life. If you are looking for a high-quality physics textbook that will help you not only master the theory, but also put it into practice, then Solid State Physics Physics of the Core. Nuclear reactions" is exactly what you need. Do not miss the opportunity to immerse yourself in the fascinating world of physics with A. P. Kashchenko!