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"spectral lines "
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Table showing star temperature related to colour.
A range of very good information on various radiation risks such as mobiles and power lines.
Applet displays the different sequences of lines that make up the hydrogen spectrum.
Introduction to magnetism, covering the magnetosphere, magnetic field lines and electromagnetic waves.
This site gives a practical demonstration on how to find the e-field
A moveable diagram including current flow and magnetic field lines that shows how the movement of a bar magnet influences the induced current in a stationary conductor.
Java Applet showing two-source interference, with lines of constructive and destructive interference drawn
A simple applet that allows you to place charges and then inserts electric field lines. Complex patterns with multiple charges can be generated.
Statements from the Institution of Engineering and Technology on the possible health effects of EM fields and radiation from power lines, mobile phones and their associated base stations.
Johannes Robert Rydberg (1854 - 1919) most important work is on spectroscopy where he found a relatively simple expression relating the various lines in the spectra of the elements (1890).
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