Introduction to light (video) | Khan Academy
Light and the electromagnetic radiation spectrum. Wave and particle-like behavior, and how to calculate the wavelength or frequency of a light wave.
The electromagnetic spectrum (article) | Khan Academy
Our eyes are exposed to light of all wavelengths, but our brains have evolved to only be able to process a small sliver of the electromagnetic spectrum. Only light between about 400 – 700 …
Why is the sky blue? (video) | Khan Academy
To quickly summarize, the reason we see the blue sky and the red sunset is because when light, or white light hits these atmospheric particles, they scatter blue light more compared to all the …
de Broglie wavelength (video) | Khan Academy
Is it a particle or a wave? This is the question that physicists of the 1920s were asking about light. In 1924, Louis de Broglie took this question to another level as he explored how electrons - …
Thermal conduction, convection, and radiation - Khan Academy
Conduction involves molecules transferring kinetic energy to one another through collisions. Convection occurs when hot air rises, allowing cooler air to come in and be heated. Thermal …
Scattering of light & Tyndall effect (video) | Khan Academy
Let's explore the scattering of light with the help of an experiment. When we shine a laser through a glass of water with few drops of milk, we can see the path of light. This effect is often called …
Huygen's theory of light & wavefronts (video) | Khan Academy
Huygen's proposed that light is a longitudinal wave in the aether medium - a medium that pervades the entire universe. The set of particles oscillating in phase with each other is called …
Protons, neutrons, and electrons in atoms - Khan Academy
Something examples that are not made of protons, neutrons and electrons are various particles, like leptons (electron, muon, and tau), weak bosons, photons (light, or EM radiation), neutrinos …
Photon energy (video) | Modern physics | Khan Academy
Learn what a photon is and how to determine the energy of a photon as you explore the dual nature of light as both a wave and a particle, known as wave-particle duality.
Refraction and light bending (article) | Khan Academy
What is refraction and why does it happen? Why does light bend when being changed into one median to another? And where can we observe refraction the most?