19 JAN 2013 by ideonexus

 Why Cell Phone Radiation Does Not Cause Cancer

Physics explains why no links were found. The microwaves used in cell phone transmissions do not have enough energy to break the chemical bonds of DNA, which is how cell mutations occur and cause cancer. How do we know this? Light and other parts of the electromagnetic spectrum, including microwaves, radio waves, infrared waves, and ultraviolet light waves, are all forms of radiation. A single unit of radiation is called a photon. A photon can be thought of either as a particle or as a wave. ...
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An explanation of radiation, it's different wavelengths, and why microwave radiation cannot damage a cell because it cannot break molecular bonds.

22 MAR 2012 by ideonexus

 1420 megahertz

In the Next Generation episode “Galaxy's Child,” the Enterprise stumbles upon an alien life-form that lives in empty space, feeding on energy. Particularly tasty is radiation with a very specific frequency 1420 million cycles per second, having a wavelength of 21 cm. In the spirit of Pythagoras, if there were a Music of the Spheres, surely this would be its opening tone. Fourteen hundred and twenty megahertz is the natural frequency of precession of the spin of an electron as it encircles th...
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The natural frequency of precession of the spin of an electron as it encircles the atomic nucleus of hydrogen, it is the tone of the universe.

28 JAN 2012 by ideonexus

 The Wonder of X-Rays Affecting a Photographic Plate

But in its [the corpuscular theory of radiation] relation to the wave theory there is one extraordinary and, at present, insoluble problem. It is not known how the energy of the electron in the X-ray bulb is transferred by a wave motion to an electron in the photographic plate or in any other substance on which the X-rays fall. It is as if one dropped a plank into the sea from the height of 100 ft. and found that the spreading ripple was able, after travelling 1000 miles and becoming infinite...
Folksonomies: physics x-rays electron
Folksonomies: physics x-rays electron
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Bragg compares it to a wave traveling 100 feet to knock a board out of a ship.

14 DEC 2011 by ideonexus

 Problems with Viewing the Cosmos Through the Atmosphere

The earth's atmosphere is an imperfect window on the universe. Electromagnetic waves in the optical part of the spectrum (that is, waves longer than X rays and shorter than radio waves) penetrate to the surface of the earth only in a few narrow spectral bands. The widest of the transmitted bands corresponds roughly to the colors of visible light; waves in the flanking ultraviolet and infrared regions of the optical spectrum are almost totally absorbed by the atmosphere. In addition, atmospher...
Folksonomies: astronomy atmosphere
Folksonomies: astronomy atmosphere
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An argument for why we needed the Hubble Telescope.