Spectrum Definition and 765 Threads

Homework Statement In Gasiorowicz's textbook, he provided the schemetic expession of the wave function(95page) ; psi(x) = Sigma[C_n X U_n(x)] + Integral[dE C(E) X u_E(x)] ("X" means multiplication symbol) In this equation, I think that 1st term(sigma) is the case of the discrete spectrum and...

Hi I'm trying to get my head around this plot of the cosmic microwave background radiation. http://www.astro.ucla.edu/~wright/CMB-LCDM-w-WMAP.gif I've been searching all around to find out what exactly a angular power spectrum is. I know what an ordinary power spectrum is. I'm a second...

A detailed picture of the Hydrogen red line shows a lot of detail: The difference in the 2 largest peaks is the fine structure, the lamb shift is clearly noted, but what are the other 2 bumps just below the lamb shift in the upper chart. I was thinking hyperfine, but I don't think that...

I need blibiography of analysis of the spectrum I read in B. Green pp 113, but I no understand.

Okay, I don't know if this is the proper place for this or not, so if it needs moved, move it. But here's my question. If the EM spectrum has no upper limit. Is it possible to have a waveform who's wavelength is twice the size of the known universe? This would put the observable universe within...

I'm going through some notes and came upon a question... So, the absorption sepctrum can be seen when a gas sample is placed in the path of white incandescent light where the light absorbes descrete wavelengths. I read that only some of these absorption lines appear if the gas is cool, but...

what the energy spectrum to second order in the field strength for a spherical shell?

Homework Statement Prepare a table of spectral lines by color, with correct wavelengths, and corresponding energies for every line spectrum you observed. Pick one line spectrum and explain the order of color from least to most energeticHomework Equations I'm not quite sure what to do here. I...

Homework Statement Let 1 \leq p \leq \infty and let (X,\Omega, \mu) be a \sigma-finite measure space. For \phi \in L^\infty(\mu) , define M_\phi on L^p(\mu) by M_\phi f = \phi f \forall f \in L^(X,\Omega,\mu). I need to find the following: \sigma(M_\phi) , \sigma_ap(M_\phi), and...

I'm doing a project about astronomy. I've never done one, I just jumped from quantum physics to here, so I don't think I know anything =.=. To start, I think I need some stars spectrum, but since stars are not as bright as the sun, I don't really know how to have them. Could someone give me some...

Hi, I've been measuring the flux of cosmic ray muons as a function of zenith angles. I have calculated the flux but do not know an equation to calculate the energy flux associated with it. My scintillator stops muons that are and below 150MeV if that's any help

Uhm...I'm doing some experiment with some unknown gas tubes. I have a spectrum when I use the grating. Can I, by some ways, use the quantum numbers to identify what the gas inside is...? I've heard of one method, but I could not find the name. Thank you in advance.

*This isn't actually coursework but i was under the assumption that questions go to this forum* Homework Statement Hi, for while I've been under the impression that spectral lines of all the elements can be calculated. I did some research and found that there is a simple equation (Rydberg...

The spectrum tubes work by runnig an electric current through a sealed tube containing gas. What common use of this method can you think of?

Hi, I'm trying to think up a way to shift IR rays into visible light spectrum so that the human eye can effectively see the IR image. Is it possible to do such a feat with something as simple as goggles made from a special material (e.g. anti-stokes pigments)?? If not possible with such...

Homework Statement Show that if A is a normal operator in an n-dimensional vector space, and if A has r distinct eigenvalues a1,a2,...ar, then the projection operator onto the subspace with eigenvalue ai can be written as: Pi=[(A-a1)...(A-aa-1)...(A-ar)]/[(ai-a1)...

Homework Statement Let the baseband signal be s(t)=cos(2πfst+π3), where fs=5kHz. Radio carrier is c(t)=sin(2πfct), where fc=100MHz. Using the amplitude modulation of g(t)=(1+s(t))c(t), what is the frequency spectrum of the modulated signal g(t)? What are the amplitude and phase shift of...

Homework Statement In the rotation spectrum of 12C16O the line arising from the transition l = 4 -> 3 is at 461.04077GHz, while that arising from l = 36 -> 35 is at 4115.6055GHz. Show from these data that in a non-rotating CO molecule the intra-nuclear distance is s ~ 0.113 nm, and that the...

Homework Statement What region of the electromagnetic spectrum contains wavelengths the size of an atom? (10^-10 meters) What frequency does this wavelength correspond to? Homework Equations velocity=wavelength(frequency) The Attempt at a Solution 3x10^8/1x10^-10=f i think i...

Hi Is there any other effect than the Zeeman effect that can broaden a spectral line in a magnetic field? /Johan

calculating the stable orbitals for multielectron atoms is so complex that AFAIK it can't be done accurately. so how does the electron in the ground state 'know' that if it jumps to a certain energy level that it will be stable? (which it apparently does know since it 'knows' exactly what...

Lots of works about the high-order harmonic generation in the intense laser-atom physics obtain the harmonic spectrum by Fourier transformation of the dipole moment d(t) (=\int\varphi\varphi^{*}z): p(\omega)=|\frac{1}{tf-ti}\int d(t)exp(-i\omega)dt|^{2} Here, I want to use the Monte-Carlo...

Hi, I have an image of a graphic describing the spectrum of a supernova Ia, the problem is that I don't really know how to read it. I'd like to know if there's any importance in this image that can drive us to think about dark energy (or accelerated expansion). The explanation of the graph...

Homework Statement Find the energy spectrum of a system whose Hamiltonian is H=Ho+H'=[-(planks const)^2/2m][d^2/dx^2]+.5m(omega)^2x^2+ax^3+bx^4 I gues my big question to begin is what exactly makes up the energy spectrum. I know the equation to the first and second order perturbations...

This is more of a data analysis question than a mathematics question so feel free to move it to wherever you think it is most likely to be answered. I have some time series data that looks (just by eye) like it should have several peaks in its power spectrum. However, when I compute the power...

Hi! The question is Suppose we are irradiating a sample of a low pressure gas and some of the radiation is absorbed. Some books say we will obtain a discontinuous spectrum! But if we are irradiating a sample of a low pressure gas we will have absorption and emission at the same time and the...

Homework Statement What is the minimum number of lines per centimeter that a grating must have if there is to be no second-order spectrum for any visible wavelength? (Let visible region extend from 400 nm to 570 nm.) Hint: Draw a diagram showing the relative positions of the rays corresponding...

I am interested in finding and understanding the relationship between the hydrogen spectrum (which of the lines are more intense) and the pressure that the hydrogen gas is under. Does hi-pressure gas mean lots of ultraviolet or hardly any? Is there a chart somewhere? TIA

So I have a power spectrum of a given function, which is supposed to be a superposition of four sinusoidal terms with frequencies that range from 1xomega to 4xomega. My spectrum looks something like this: http://upload.wikimedia.org/wikipedia/commons/4/4f/Triangle-td_and_fd.png What exactly...

URGENT spectrum lines Homework Statement A diffraction grating (with 10,000 lines per cm) is held 2 meters from a Hydrogen lamp (lamp which emits Hydrogen’s spectrum). As you look through the diffraction grating a blue line is observed to lie 1.11 meters on either side of the lamp. 1) What...

I don't mean to violate any rules or conventions; these are questions pertaining to labs I'm doing as part of an undergrad degree. It's not homework, as such, so I've not put it in one of those forums But my apologies if this is incorrect. Anyhow; the experiment that bothers me is a...

We did a chemistry experiment were we burned different metal chlorides on the bunsen to observe the different flame colors produced. Anyhow I'm writing up the report but there's one thing I'm not sure about. I can't make any mistakes because I made the mistake of displaying way too much...

How many wavelengths could appear in the spectrum of hydrogen atoms initially in the n=5 state?

Homework Statement This is from Advanced Physics by Adams and Allday, part 8 Modern Physics, Practice Exam Question 15. The spectrum of atomic hydrogen contains a prominent red line having a wavelength of 6.60 x 10-7 m. Calculate the energy of a photon with this wavelength. The...

Homework Statement As you drive by an AM radio station, you notice a sign saying that its antenna is 112m high. If this height represents one quarter-wavelength of its signal, what is the frequency of the station? Homework Equations c (speed of light) = f (frequency) x d...

Hi I had some questions about the nature of the spectrum of electromagnetic radiation, as to whether it is continuous or quantifiable, and whether it is infinite or finite. I haven't been able to find satisfactory answers so far and I'm very interested in the knowledge of this forum. Can the...

Homework Statement Give the structure of C8H8O3.Homework Equations IR tells us that there is an OH group and a C=O group Degree of saturation = 5 --> Benzene ring + C=O H NMR spectrum shows: Peak at ~7.8ppm integrating for 1H and is a doublet Peak at ~7.45ppm integrating for 1H and is a...

In a condition of high pressure, how could vary the Helium emission spectrum? Is this spectrum modified from the pressure?

Difference Spectrum of 4-nitrophenol Homework Statement difference spectrum of 4-nitrophenol Difference spectrum obtained has y-axis coresponding to \Delta Absorbance. Consider shape and absorbance values over chosen range of wavelengths. Use beer lambert relationship, explain why...

Let X be a C^*-algebra. I know that if x\in X is self-adjoint, then its spectrum is real, \sigma(x)\subset\mathbb{R}. I haven't seen a claim about the converse, but it seems difficult to come up with a counter example for it. My question is, that is it possible, that some x\in X has a real...

Homework Statement An amplitude-modulated cosine wave is represented by the formula x(t) = [ 10 + cos(2*pi*(2000)*t) ] * cos(2*pi*10^4*t) Sketch the two-sided spectrum of the signal. Be sure to label important features of the plot. The Attempt at a Solution x(t) = 10 * cos(2*pi*(2000)*t) +...

Hi all, Recently I came across an interesting question: "...Why do astronomers attribute the observed Doppler shifts of a Cepheid variable as pulsation, rather than to some other causes, such as orbital motion? " OK, I have my ideas about the problem as there is a correlation between e...

Does anyone have a good mnemonic to remember Electromagnetic Spectrum either according to increasing wavelength or frequency? Thanks!

im doing an extended essay at school and i am loooking for help to adjust/refine my ideas. basically I am investigating properties of the visible spectrum of light. one idea is that the size that each colour has within the spectrum green, large, yellow, small corresponds to there...

Homework Statement Iron produces many lines in the visible spectrum when given energy. Suggest why a sample of iron sulphate only produces lines in the green section of the spectrum. Sorry if it doesn't sound very scientific, I am recalling the question from memory since I've already handed...

Hi.. My department is considering to purchase an Optical Spectrum Analyzer (OSA). I had run a search on GlobalSpec, but I am really getting confused over the hundreds of spectrum analyzers available. I am looking for a diffraction-grating based analyzer that covers a broad range of...

This is a link to a different thread. I hope that's ok. As the parent of an autistic child, I have a few differences of opinion with Mr. Savage. While it is true that his comments were taken somewhat out of context, they are still wrong even when that context is supplied. Note that he spoke at...

I did some simulations where I created a BPSK signal, and then found the spectrum of the signal. The spectrum had a peak at the carrier frequency. It also had peaks at regular intervals frequencies higher than the carrier frequency. There were no peaks at frequencies lower than the carrier...

Hi, there! That's probably the most relevant forum thread where I can consult pros about my problem. Well, I'm a visual programmer and quite far of Spectra Physics to what my issue's dramatically related to. Specifically, I need to implement in C# the frequency-domain signal filtration (with a...

hello can you help me with my homework regarding electromagnetic spectrum and the answering the following questions thank you. 1. define the topic 2. describe the subject matter 3. explain how it works 4. diagram to support explanation thank you