tarak Posted March 9, 2005 Report Share Posted March 9, 2005 What is the range of cosmic spectrum identified by humans?In the past two centuries different regions of the spectrum have been identified and we are enjoying the fruits of these spectra in the form of different utilities.Are there any superwavelengths which can carry more information and make our wireless world more effective?? Link to comment Share on other sites More sharing options...
maddog Posted March 9, 2005 Report Share Posted March 9, 2005 The EM spectrum is broken into bands. Visible light is between (about 1100 nm - 440 nm) (red - blue)The UV spectrum is just on the other side of blue. X-Rays are below 90 nm Infrared go 1400 - 20k+ nm Microwave ~ .1 mm - 14 cm or so Radio ~ 14 cm - 100 m (below AM) These are rough numbers yet give you a feel for the ranges. For more accurate infoconsult a Handbook on RF (It will have the whole exact spectrum), found at your locallibrary. Maddog Link to comment Share on other sites More sharing options...
Aki Posted March 9, 2005 Report Share Posted March 9, 2005 It is possible to have waves that are beyond this range, and cannot be currently detected by our machines. Link to comment Share on other sites More sharing options...
Turtle Posted March 9, 2005 Report Share Posted March 9, 2005 At the smaller end, gamma radiation is it, I think the general view is there is a limit; you know, tied to the Planck constant or something. On the big end, it seems the longest wave (lowest frequency) would derive from the diameter of the universe. The longer it keeps expanding, the longer a corallary wave lengthens.___The difficulty in building receiving & transmitting equipment is one of size. The ELF antennas the navy is using to communicate with submarines run for dozens of miles. To hear the lowest frequency you need a universe sized antenna. Link to comment Share on other sites More sharing options...
TeleMad Posted March 12, 2005 Report Share Posted March 12, 2005 The difficulty in building receiving & transmitting equipment is one of size. The ELF antennas the navy is using to communicate with submarines run for dozens of miles. To hear the lowest frequency you need a universe sized antenna. And at the other end of the spectrum the difficulty is with power: the smaller the wavelength the greater the amount of energy needed to produce each photon. Link to comment Share on other sites More sharing options...
Qfwfq Posted March 16, 2005 Report Share Posted March 16, 2005 Classically, the higher the frequency the more info you can pack in. Just consider the Fourier transform. And at the other end of the spectrum the difficulty is with power: the smaller the wavelength the greater the amount of energy needed to produce each photon.The main problem that creeps in is coherence between photons. The energy h-nu for x-rays and gamma rays isn't so huge as to bar them out for total power. Coherence becomes a greater problem beyond visible and UV frequencies. Link to comment Share on other sites More sharing options...
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