Modern Physics
De Broglie Wavelength: λ = h/mv Formula, Derivation & Examples
Every electron, baseball, and person you have ever seen has a wavelength. That single idea is the de Broglie wavelength,…
Modern Physics
Modern Physics
Half-Life Calculations: Formula & Worked Examples Explained
Half-life calculations tell you exactly how much of a substance remains after a set amount of time. You only need…
Modern Physics
Mass-Energy Equivalence: E = mc² Derivation & Nuclear Applications
A tiny pinch of matter, if fully converted, could power a city for days. That staggering fact comes from Mass-Energy…
Modern Physics
Nuclear Decay Equations: Alpha, Beta & Gamma Decay Explained
An unstable nucleus doesn’t just sit there forever — sooner or later it transforms, spitting out radiation and becoming a…
Modern Physics
Photoelectric Effect Calculations: hf = work-function + KE_max
Shine light on a piece of metal and, if the light is energetic enough, electrons fly off it instantly. That…
Modern Physics
Quantum Numbers: n, l, m_l, m_s and Electron Configuration
No two electrons in the same atom are ever in exactly the same state — not even the two crammed…
Electromagnetism
Electric Charge and Coulomb’s Law: F = kq₁q₂/r² Explained
Electric Charge and Coulomb’s Law: Rub a balloon on your hair and it clings to the wall for minutes afterward.…
Electromagnetism
Coulomb’s Law Calculations: F = kQ1Q2/r² Formula & Examples
Two charged balloons pushed apart after rubbing them on your hair is the same physics that keeps every atom in…
Electromagnetism
Capacitors and Capacitance: C = Q/V Formula, Energy Storage & Examples
Every camera flash, every laptop charger, every heartbeat restarted by a defibrillator relies on a component most people walk past…
Electromagnetism
Electric Potential Energy: E = kQq/r, Work Done & Worked Examples
Push two magnets’ like poles together and you can feel the resistance building in your hand — that resistance is…