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hyperphysics

Blackbody Radiation

Blackbody radiation refers to an object or system which absorbs all radiation incident upon it and re-radiates energy which is characteristic of this radiating system.

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Blackbody radiation and the “ultraviolet catastrophe”

The story of the blackbody radiation and the ultraviolet catastrophe which eventually led to quantum mechanics.

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Blackbody Radiation

A good introductory page to this topic.

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hyperphysics

Planck's Hypothesis

In order to explain the frequency distribution of radiation from a hot cavity (blackbody radiation) Planck proposed the ad hoc assumption that the radiant energy could exist only in discrete quanta ...

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Ionising Radiation and Health

Radiation can interact with surrounding matter to produce positively and negatively charged particles (a type of electricity). This process is called ionisation, hence the term ionizing radiation.

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hyperphysics

Synchrotron Radiation

When moving charges spiral in a magnetic field, they produce radiation as a result of their accelerations which is called synchrotron radiation.

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Hyperphysics - Radiation Risk

Units of radiation, description of risk of radiation, comparing old and new units with good links to other relevant parts of the site.

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What Is Ionizing Radiation?

This fact sheet describes ionizing radiation, how it behaves and how it can affect human health. Three types of ionizing radiation are alpha particles, beta particles, and gamma rays.

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Radiation

A range of very good information on various radiation risks such as mobiles and power lines.

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Radiation Heat Transfer

Page giving the Stephan-Boltzman radiation equation.

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