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 ...
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 ...
Antimatter
Antimatter is a substance made up of subatomic particles that have the same mass as ordinary matter, but with opposite electric charge and parity. For example, an electron has a negative charge, while the positron, has a positive charge. More ...
Vectors Position and Displacement
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Newton's Third Law
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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 ...
Absorption and Emission Spectra
Absorption are produced when atoms absorb energy and create dark lines or gaps in the spectrum. Absorption spectra can range from narrow lines to broad bands. Emission spectra are emitted by an atom or compound when electrons transition from a higher energy state to a lower energy state. More ...
Understand E = mc^2
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Multiplying Vectors
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Force and Mass
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