Projectile Motion
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Bohr's Explanation of the Hydrogen Spectrum
In 1915, Danish physicist Niels Bohr proposed that electrons orbit the nucleus of an atom at fixed energy levels, and that orbits further from the nucleus have higher energy levels. Electrons emit energy in the form of light when they return to a lower energy level. More ...
Force Vectors
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How to Enrich Uranium
Uranium enrichment increases the percentage of uranium-235 (U-235) in uranium. Natural uranium has 0.7% U-235, while nuclear reactor fuel needs 3-5%. More ...
Particle Accelerators
The fundamental process in creating unknown particles is to accelerate known particles, such as protons or electrons, and direct a beam of them toward a target. More ...
The Periodic Table of the Elements
The periodic table arranges all the known elements into rows (called periods) and columns (called groups). All elements in the same period have the same number of electron shells. Elements in the same group have the same number of valence electrons. More ...
The Standard Model of Particle Physics
The Standard Model of physics is similar to the periodic table of the elements, But instead of listing the chemical elements, it lists the fundamental particles that make up the atoms of the chemical elements. More ...
Quarks
Quarks and gluons are the building blocks of protons and neutrons, which in turn are the building blocks of atomic nuclei. They are the elementary particles in the present standard model. More ...
JVectors - Unit Vectors and Adding Vectors by Componets
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Rutherford's Experiment and The Structure of the Atom
Ernest Rutherford's (1871-1937) surprising discovery about the interior of the atom is most fundamental in explaining so many well-known phenomena. He took us from the plum pudding model to the planetary model of the atom we use today. More ...
