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Diffraction of light

Historical background and online tutorials on diffraction in which you can vary wavelength and aperture width, and see the results as wave fronts, and as an intensity graph. Explanations include the ...

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Fowler's Physics

Various applets allowing results to be taken for demonstration purposes.

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hyperphysics

Cosmic Background Radiation

A uniform background radiation in the microwave region of the spectrum is observed in all directions in the sky. It shows the wavelength dependence of a "black body" radiator at about 3 Kelvins ...

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Secrets of the early universe

Read how satellite observations of cosmic microwave background can tell us a lot about how the universe formed.

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Planck

Catch up with the latest news, videos and info on the Planck mission, which is studying the Cosmic Microwave Background – the relic radiation from the Big Bang.

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Line Rider

A fun toy that lets you build a sledge run and then test it out. You'll need a good feel for the laws of motion to get results!

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New View of Primordial Universe Confirms Sudden "Inflation" after Big Bang

New evidence for inflation, a period of rapid expansion after the start of the universe, has been found in the cosmic microwave background.

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Robert W. Wilson

Robert Woodrow Wilson (1936 - ) received the Nobel Prize for Physics in 1978 along with Arno A. Penzias for their discovery of cosmic microwave background radiation.

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Arno A. Penzias

Arno A. Penzias (1933 - ) received the Nobel Prize for Physics in 1978 along with Robert Woodrow Wilson for their discovery of cosmic microwave background radiation.

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The End of My Latin

Kaufmann's experimental results on deflection of electrons in an electromagnetic field favoured Abraham's theory, not Einstein and Lorentz, but were eventually proved wrong.

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