Electric Field
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Lines of one positive and one negative electric charge.
Notice that very near each charge the field is symmetric about the charge.
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Kepler's Law
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A light object orbiting a much
heavier one (perhaps a planet orbiting a star) sweeps out an equal
area per unit time no matter where it is in the orbit. The planet
moves faster when it is near the star.
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Feynman diagram
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This is a Feynman diagram of an electron and a positron scatering
off each other. The wavy line shows the photon they exchange in the
interaction. This is really a graph. Location is the horizontal
axis, and time is the vertical axis. Notice that one of the particles
looks like it is moving backwards in time.
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Low Energy States of a Quantum Mechanical Well
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Here are the two lowest energy states of a quantum
mechanical well. Notice that one is symmetric and the other is
anti-symmetric. Notice also that both waves leak out of the well a
bit, one more than the other.
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Spontaneous Symmetry Breaking
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This is an Ising model of spins on a regular latice.
The particular situation illustrated is spontaneous symmetry breaking:
The pattern is symmetric for 180 degree rotation about a diagonal line
from upper left to bottom right, except that any orientation of the
middle spin breaks that symmetry.
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General Relativity
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The path of Light from a distant star is bent
as it passes near to a large mass, as predicted in General Relativity.
This causes the star to appear to be to the side of the mass
when in fact it is behind it.
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