Spectrum Definition and 725 Threads

Hello, all I have just read some foundamental concepts about EM spectrum in astronomy. One thing I don't quite understand is that "Stars with higher temperature or higher pressure shows a broadened line on its absorption spectrum". A brief explanation states that a higher temperature or...

is the color spectrum simply a small segment of the electromagnetic spectrum?

Hi all, I was wondering if someone could clarify what the difference is between a spectrum analyzer and a network analyzer. Thanks, Mike

Hi, this is a silly question Energy of a free particle is not quantized. Does it mean that it should have a continuous absorption spectrum?. When a cloud of free electrons in some type of plasmas is irradiated with light, theese "hot electrons" are accelerated as they absorb light. So...

In the 1969 edition of the World Book Encylopedia it shows that cosmic rays are considered part of the electromagnetic spectrum. In later editions the diagram doesn't show cosmic rays is part of the electromagnetic spectrum. In Capras famous book "The Tao of Physics, he also shows that cosmic...

... is the visible spectrum of light supposed to contain all the colors that we are able to see? if so, where is brown?

I am wondering just which parts of the EM spectrum can we and can we still not lase in. For the purpose of this thread, I consider the visible pretty much covered. But what about the IR, is there any thing between 3 and 10 microns? What is lasable at longer wavelengths? Are masers...

Hi, I am using matlab. I was wondering if anyone knew how to take the results from a spectrum analysis of a signal in x at sample frequency fs: y = abs(fft(x,fs)); and turn it back into the signal x. My purpose is to modify the spectrum by removing certain frequencies found in the spectrum...

Is there a frequency below radio waves or above gamma rays? What makes radio waves and gamma rays the bounds of the electromagnetic spectrum?

Hi...Juz curious. I was doing the prism experiment yesterday and was just curious about how the white ray of light changes to a spectrum of colours... Has it got anything to do with the change in the speed of the different colours of light, the frequency / the wavelength? Or just purely...

talking about the hydrogen atom spectrum (energy levels) reminds me of an outstanding question in modern theoretical physics What is the area spectrum in Simplicial Quantum Gravity?" SQG is Ambjorn's name used interchangeably for the dynamical triangulation approach to quantum gravity...

Im totally new to electrical engineering, and i would like to know how to make one (spectrum analyzer)?

Hello, Can anybody help me with my question? Apparently our eyes can only see a small portion of the electromagnetic spectrum (the ROYGBIV). The actual electromagnetic spectrum range from radio waves to gamma rays. Included in this assumption is the understanding that this entire...

"When the solution is simple, God is answering." Eistein Gravity is sound reflection electromagnetic waves are merely heat or light waves effected by sound, Gravity is a low low low frequency wave -one wavelength long which reaches its earthing target at almost right angles If any...

You may find this poster of "The Electromagnetic Radiation Spectrum" of interest. http://unihedron.com/projects/spectrum/ This poster includes all known ranges of EMR including Gamma Rays, X-Rays, Ultraviolet light, Visible light, Infrared, Microwaves, Radio waves (ULF, VLF, LF, MF...

In the “ Theory development ” forum I develop my theory of a general origin of all fundamental forces. As an example of practical application of this theory I have developed the table of spectra of radiation of stars and fogs in dependence from a value of their magnetic and gravity...

Does anyone know the peak(or the energy at which the flux is the greatest) of the GCR spectrum? And a quotable source for that. I am pretty sure it is in the 1-10 GeV/nucleon range. thanks

I'm a foreign student in England studying biochemistry, 1st year undergraduate. I did an experiment yesterday on infrared spectrum and was confused by the output diagram. I also don't know about how it works. Could anyone tell me how do I look and analyse the infrared spectrum diagram and what...

hi, I am a year 11 student and i have been given a project to do about electromagnetic waves. the areas i need to cover are: uses properties effects methods of transmission, reception and propagation. dangers of exposure i have successfully researched uses, properties, effects and...

Hi,I need some help here. Why the Compton effect can not be noticed when we are using light from the visible spectrum?

Why is it bothersome that the universe has a blackbody spectrum?

I tried to obtain the spectrum of a discrete signal and I had some problems... If I compute on a PC the discrete Fourier transform (FFT or DFT) I obtain valid Fourier transforms (the same Excel computes...)... ...but how do I analyze a wave obtained using a microphone ? I don't get the same...

Lets take a unidirectional antenna. The waves you acquire are transformed into light that you can see. You designate the freq. into specific colours and what would you see?

From Kosmoi.com/Science/Cosmology/http://kosmoi.com/Science/Cosmology/Big_Bang/wiki.shtml "A critical further prediction was that the further away one looks, the hotter the universe should appear to be (as looking further away corresponds to looking backwards in time), and at some extremely...

I know that there are devices which shift or replace wavelengths of light that are out of the visible spectrum so that we can see them. What would be the result of having a device which can sense artificial light bypass the restrictions of our eyes and send impulses directly to our brain. If our...