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Physics: explore STEM content (page 13 of 27) · openstem
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Physics
Mechanics, electromagnetism and quantum on openstem — flashcards, notes, quizzes, plots and sketches shared by the community. Study free, or clone anything into your library.
What does a wave carry from one place to another?1 / 10
Energy. A wave carries energy from place to place without carrying the matter it travels through along with it — the water, air, or rope stays roughly where it started.
Global to local The Standard Model is built by one repeated move: take a global symmetry of a free theory and demand it hold locally, with a different transformation α(x) at every point. A free Lagrangian doesn't survive that demand, and fi
Physics
Physics · L5 · Gauge Theories and the Higgs Mechanism
AThe point where all of its weight seems to act from — its overall balance pointBThe exact geometric center of every object, no matter how its weight is spread outCThe point where an object is glued or bolted to the groundDThe single heaviest atom inside the object
Each field mode is a harmonic oscillator Quantise the electromagnetic field and every independent mode (fixed ω, wavevector, polarisation) turns out to be mathematically identical to one quantum harmonic oscillator. Coherent states: as clas
Physics
Physics · L5 · Quantum Optics: Coherent States and Cavity QED
Putting a number on the push or pull You know the rule already: like charges repel, opposites attract. Coulomb's law says exactly how hard. Inverse square, again Same mathematical shape as Newton's law of gravitation. Double the distance an
ALight bouncing straight back off a mirrorBLight bending as it passes from one material into anotherCLight splitting into different coloursDLight disappearing when it hits glass
Wind is just air on the move Air surrounds you all the time even though you can't see it. When it moves, that's wind. Catching the push Some things are built with a big flat or angled surface specifically so wind has something to shove agai
How many times a simple machine multiplies the force you put in. A mechanical advantage of 4 means the machine turns your push into a push four times as strong.
Different shapes, same strong ends Magnets come as straight bars, bent horseshoes, and rings like a donut. Whatever the shape, the pull is always strongest at the two ends, called the poles. The middle barely pulls at all. A horseshoe magne