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Welcome to eGyanKosh’s Unit-5 on “द्रव्य तरंगें और अनिश्चितता सिद्धांत” (Matter Waves and Uncertainty Principle), a comprehensive study material designed for IGNOU students in 2025. This unit delves into the fascinating intersections of quantum mechanics, exploring the fundamental concepts of wave-particle duality and the principles that govern uncertainty in measurements. Whether you are preparing for exams or seeking to deepen your understanding of these pivotal theories, our free downloadable resources offer you detailed explanations, illustrative examples, and valuable insights to enhance your learning experience. Join us on this enlightening journey through the realms of physics, where the mysteries of matter and the universe await your exploration!