https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:intermolecular-forces-and-properties/x2eef969c74e0d802:electronic-transitions-in-spectroscopy/v/electronic-transitions-and-energy 2022-10-05T02:43:18.611402953Z Electronic transitions and energy Electronic transitions occur in atoms and molecules due to the absorption or emission of electromagnetic radiation (typically UV or visible). The energy change associated with a transition is related to the frequency of the electromagnetic wave by Planck's equation, E = h𝜈. In turn, the frequency of the wave is related to its wavelength and the speed of light by the equation c = 𝜆𝜈. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/5e72f648-3848-4b8f-85fa-74b3d1c6ef69_1280_720_base.png Electronic transitions and energy Electronic transitions occur in atoms and molecules due to the absorption or emission of electromagnetic radiation (typically UV or visible). The energy change associated with a transition is related to the frequency of the electromagnetic wave by Planck's equation, E = h𝜈. In turn, the frequency of the wave is related to its wavelength and the speed of light by the equation c = 𝜆𝜈. https://cdn.kastatic.org/ka-youtube-converted/ukYSvaRyE3c.mp4/ukYSvaRyE3c.mp4 472 Quantum phenomena: photons, particles, and measurement limits https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:intermolecular-forces-and-properties/x2eef969c74e0d802:electronic-transitions-in-spectroscopy/v/worked-example-calculating-the-maximum-wavelength-capable-of-ionization 2022-10-05T02:43:18.611402953Z Worked example: Calculating the maximum wavelength capable of ionization If a photon has enough energy, it can completely remove an electron from an atom or molecule. In this video, we'll use the light equations (E = h𝜈 and c = 𝜆𝜈) to calculate the longest photon wavelength capable of removing an electron from a single atom of silver. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/ee31445d-5943-453a-964d-12a0dd41f375_1280_720_base.png Worked example: Calculating the maximum wavelength capable of ionization If a photon has enough energy, it can completely remove an electron from an atom or molecule. In this video, we'll use the light equations (E = h𝜈 and c = 𝜆𝜈) to calculate the longest photon wavelength capable of removing an electron from a single atom of silver. https://cdn.kastatic.org/ka-youtube-converted/BR7Svm1s8fs.mp4/BR7Svm1s8fs.mp4 380 Quantum phenomena: photons, particles, and measurement limits https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:intermolecular-forces-and-properties/x2eef969c74e0d802:electronic-transitions-in-spectroscopy/e/electronic-transitions-in-spectroscopy 2026-04-07T23:36:17.218592739Z Electronic transitions in spectroscopy Check your understanding of electronic transitions and photoionization in this set of free practice questions designed for AP Chemistry students. exercise https://www.khanacademy.org/science/biology/structure-of-a-cell/introduction-to-cells/a/microscopy 2021-04-29T08:02:10Z Microscopy Introduction to microscopes and how they work. Covers brightfield microscopy, fluorescence microscopy, and electron microscopy. article https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:from-cells-to-organisms/x230b3ff252126bb6:the-cellular-basis-of-life/a/cell-biology-and-microscopy 2025-11-07T05:50:37.873729281Z Cell biology and microscopy Learn about cell biology and the different types of microscopes that allow us to observe cell structure and function. article https://www.khanacademy.org/science/chemistry/atomic-structure-and-properties/orbitals-and-electrons/v/heisenberg-uncertainty-principle 2022-11-16T04:22:43.7414897Z Heisenberg uncertainty principle The Heisenberg uncertainty principle states that there is a limit to how precisely certain pairs of physical properties of a particle can be known simultaneously. Explore the Heisenberg uncertainty principle by calculating uncertainty in position given the uncertainty in momentum for Bohr model of hydrogen. Jay video https://cdn.kastatic.org/googleusercontent/YlDCo7dEqveyVEBE20fbsEpj-iDswzPLGJtzfQsmtqcX_tX3vnJLpqpGtBbsJz5xQxPpFE5Pd47uIcPQv-gAUPes Heisenberg uncertainty principle The Heisenberg uncertainty principle states that there is a limit to how precisely certain pairs of physical properties of a particle can be known simultaneously. Explore the Heisenberg uncertainty principle by calculating uncertainty in position given the uncertainty in momentum for Bohr model of hydrogen. https://cdn.kastatic.org/ka-youtube-converted/PZIoFD_Z73M.mp4/PZIoFD_Z73M.mp4 618 Quantum phenomena: photons, particles, and measurement limits https://www.khanacademy.org/science/revision-term-1-tg-chemistry-class-11/x3f2cd496ba25689a:week-1/x3f2cd496ba25689a:atomic-structure/e/de-broglie-heisenberg-uncertainty 2025-12-29T11:51:22.938476225Z de broglie wavelength and Heisenberg's Uncertainty Principle Let's solve a few questions on de Broglie Wavelength and Heisenberg's Uncertainty Principle. aman saurav exercise