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Fraunhofer's observation of spectral lines was a complete accident. Find out more about the absorption spectrum here.
Explanation of the absorption of photons in an hydrogen atom and its energy levels. Use of the Bohr and Rydberg equations.
Taking the electron transitions associated with visible and ultraviolet interactions with matter as an example, absorption of a photon will occur only when the quantum energy of the photon precisely ...
Rudolf Ludwig Mossbauer (1919 - ) main work was directed towards the study of absorption of gamma rays in matter, in particular the study of nuclear resonance absorption. He received the Nobel Prize ...
A magnetic field can be thought of as consisting of lines of force.
A brief description of how Digital Subscriber Lines (DSLs) work. This site is part of Marshall Brain's HowStuffWorks.com.
Short video demonstrating how light travels in straight lines
Description of the Mossbauer effect and absorption in Ir-191, with application to gravitational red shift.
Measuring the red shift for several galaxies from spectral lines.
A range of very good information on various radiation risks such as mobiles and power lines.
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