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Turning points in physics

One of five optional topics. Follows three developments that changed the subject: the electron, wave-particle duality and special relativity.

Topics in this section15
Published0 of 15
01

Cathode rays

Production in a discharge tube

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02

Thermionic emission of electrons

The principle and the accelerating pd

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03

Specific charge of the electron

Thomson's determination and its significance

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04

Millikan's determination of the electronic charge

Oil drops, Stokes' law and quantisation

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05

Newton's corpuscular theory of light

Compared with Huygens' wave theory

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06

Significance of Young's double slits experiment

Delayed acceptance of the wave theory

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07

Electromagnetic waves

Maxwell's formula, Hertz and Fizeau

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08

The discovery of photoelectricity

The ultraviolet catastrophe and Planck's quanta

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09

Wave-particle duality and electron diffraction

De Broglie's hypothesis tested

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10

Electron microscopes

The transmission electron microscope and the STM

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11

The Michelson-Morley experiment

Detecting absolute motion, and the failure to

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12

Einstein's theory of special relativity

Inertial frames and the two postulates

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13

Time dilation

Proper time and evidence from muon decay

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14

Length contraction

The length of a moving object

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15

Mass and energy in relativity

Variation of mass and kinetic energy with speed

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