"Echo Phenomenon" explores the science behind sound wave reflection and its wide-ranging applications, especially in sonar technology. It reveals how understanding echoes allows us to "see" in environments where light fails, like underwater mapping and medical imaging. For instance, bats use echolocation to navigate, showcasing nature's optimized echo-based systems, a concept known as bioacoustics.

The book starts with the physics of sound and its interactions with surfaces, building a theoretical base. It then examines sonar technology, covering its development and uses in marine biology and navigation. Finally, it looks at echo-based techniques in fields like medical ultrasound and non-destructive testing.

Throughout the chapters, experimental data from acoustics, oceanographic surveys, and medical case studies support the arguments. It's designed for physics and engineering students, as well as professionals in acoustics, offering accessible explanations of complex equations with illustrative examples.