Atoms are the foundation of chemistry. They are the basis for everything in the Universe. In this second unit of class 11 chemistry, we will learn the discovery of subatomic particles- electrons, neutrons, & protons, atomic models of J.J Thomson's, Rutherford's, Bohr's. We will learn the dual nature of light and electron, quantum mechanics, quantum numbers. We will also learn the rules for writing the electronic configurations of atoms.
Curated by: Khan Academy India - English (37 videos)
Is light a wave or a particle or both? In this video, we explore the idea of dual nature of matter and radiation, and how a series of groundbreaking experiments changed our understanding of light and particles forever. We’ll walk you through how interference and diffraction proved light’s wave nature, how black body radiation and the photoelectric effect revealed its particle behavior, and how these two sets of observations led to the concept of dual nature. This isn’t just a theory, it’s the realization that not just light, but even particles like electrons can behave like waves and exhibit dual nature, laying the groundwork for quantum mechanics. Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! https://www.khanacademy.org/science/class-11-chemistry-india/xfbb6cb8fc2bd00c8:in-in-structure-of-atom?lang=en Timestamps: 00:03 - Wave nature of light 00:30 - Electromagnetic spectrum 00:55 - Wavelength- frequency relation 01:35 - Reflection and refraction 01:43 - Interference 02:47 - Diffraction 03:20 - Black body radiation 04:38 - Peak intensity wavelength at a particular temperature. 05:15 - Photoelectric effect 06:54 - Observations proving dual nature 07:32 - Matter waves Khan Academy India is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We have videos and exercises that have been translated into multiple Indian languages, and 15 million people around the globe learn on Khan Academy every month. Support Us: https://india.khanacademy.org/donate Created by Aman Saurav