Spectrum Definition and 725 Threads

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...

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...

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...

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

I'm looking for a picture like this http://lasp.colorado.edu/~bagenal/1010/graphics/jupiter_spect.gif but with the spectrum of the moon instead. ¿Can someone help?

I feel I have a good grasp of the complex Fourier series, but I'm struggling with a few things still. When I take, say, an fft in MATLAB (with an even number of data points) I obtain a spectrum that looks like this [DC] [ + freqs ] [Real Valued Number] [-Freqs] With...

One more question (I'm wary I'm totally spamming the forum!).. its in reference to the decay of Cr to V, see attached files. The decay is clearly beta plus decay. p->n+positron+antineutrino The question asks to determine the neutrino spectrum. Now the energy of the neutrino is simply...

[SOLVED] Mass Spectrum * Fragmentation: 1. The problem, I've been having is how to tell a certain m/z (mass per a charge) value for fragmentation. Like the examples they give in the book have the values, but then we are expected to know the values of diffrent compounds, that aren't even in the...

I have a molecule and I'm barely accostumed to H-NMR and C-NMR this has neither it's trifluorophosphine I have to predict the splitting, intensities and frequency the first two I think I have some idea about but I don't even know where to look on how I could calculate this it seems like if...

Let A be a bounded operator in complex Hilbert space. Prove that \sigma(Exp(A))=Exp(\sigma(A)). It is known, that \sigma(P(A))=P(\sigma(A)), where P is a polynomial. In addition, if an operator A has a bounded inverse, then for any operator B such that ||B||<1/||A^{-1}|| their sum A+B...

All the below is presented in latex format. In Schroeder's intro to thermal, problem 7.38, he asks you to substitute \lambda = \frac{hc}{\epsilon} into the following equation \frac{U}{V} = \int^{\infty}_{0} \frac{8 \pi \epsilon^{3}/(hc)^{3}}{e^{\epsilon / kT}-1} d \epsilon...

Why have I not seen equations that would tell the masses of hadrons as functions of other constants, like masses of quarks, and some coupling constants? After all, aren't the different hadrons merely different excitation states of some bound systems, and in principle it should be possible to...

Hi all. I'm an A Level Physics student and my teacher couldn't really answer this question i had.. Why can Radio Waves, Micro Waves, X Rays and Gamma Rays go through things (like walls etc) but the others can not. My understanding is that they are all just different frequencies of photon...

Is rainbow a prismatic spectrum or grating spectrum ? I think it is a grating spectrum as Deviation Order(violet least and red most) is same as that of grating Source is at infinity (sun) Image is at infinity

Is the spectrum of reflected light of a planet the same as the spectrum of the star near it but just less in magnitude? Like when you do B(Lambda;T) for it you just multiply that answer by the albedo?

hi guys I am new here. for my final year physics assignment i am testing how colors are absorbed under water at different depths. i am planning to go scuba diving and take photos of a color spectrum at certain depths as was wondering if anyone here new much about this and would be able to...

Are there wavelength limits at either end of the Electromagnetic spectrum? Is it true there could be a wavelength the size of the universe? What happens at the other end? Is there a quantum limit?

Homework Statement Show that the spectrum \sigma of a linear continuous Hermitian operator A on a Hilbert space H consist of real numbers, ie \sigma(A)\subset \mathbb{R} . Homework Equations Well the spectrum of A are the elements \lambda\in\mathbb{C} such \lambda I - A is NOT...

I found an emission spectrum and an absorption spectrum of some element in my book. The lines match, but there are less lines in the absorption spectrum... What's the meaning of this? All other examples I found on the internet have the same amount of lines, which seems pretty logic to me.

The spectrum of flux for a synchrontron source ( AGN for example) drops off at low frequencies. Is that a sensible situation? How comes??

Homework Statement I'm having some trouble working out the math for the D-lines in the sodium spectrum. Now the measured wavelengths are 5889.96 angstroms and 5895.93 angstroms. It's easy enough to find the energy difference between these to be .00213 eV. Now I'm supposed to be able to...

Input: sine wave at 10Hz, amplitude 1. After the transform the plot has a spike at 10Hz with amplitude 0.5. If I vary the amplitude of the sine wave I get: sine amp. - FT spike amp. 1 - 0.5 2 - 2 4 - 8 So it seems A' = A^2/2 Is this because power is proportional to A^2 and it is...

I need to implement a stereo oscilloscope and spectrum analyzer using C or matlab.. I am familiar with the basic commands regarding wav files in matlab. i also created a very simple music synthesizer. regarding the stereo oscilloscope, how do you get to display the sound wave in real time...

Do you know some soft. which could analyze light spectrum(.jpg)?

I am looking for a way to calculate the power spectrum of short signals of variable duration (between 200 and 500 ms). Standard methods seem wildly inaccurate. Are there any tricks for short segments? Thanks anyone for a response.

I know both can graph waveforms but I'm a bit confused about what spectrum analyzer graphs tell you. I read an explanation that says http://www.andrew.cmu.edu/user/ebuehl/robosapien-lirc/oscilloscope.jpg That I understand but the explanation of spectrum analyzers is a bit more...

Id think theyd be rational free market types but some maybe more socialist wanting more funding for maths departments. I didnt realize there was a general area here till today.

Homework Statement Calculate the power spectrum in dBm of a zero offset, 10MHz square wave with amplitude A from DC to 50MHz. Homework Equations - The Attempt at a Solution I was given this problem but am not sure how to go about solving it. Is the power spectrum the same as the...

I have been looking at the flux of muons (as secondary cosmic ray particles) at the Earth's surface as a function of both energy and angle from the zenith. From what I have read, the flux follows a squared cos theta relationship with angle from the zenith and several attempts have been made to...

Homework Statement An astronomer observes a hydrogen line in the spectrum of a star. The wavelength of hydrogen in the laboratory is 6.563 x 10-7m, but the wavelength in the star’s light is measured at 6.56186 x 10-7m. Which of the following explains this discrepancy? A) The star is...

Can a self adjoint operator have a continuous spectrum ?? If we have a self adjoint operator Ly_{n} = \lambda _{n} can n take arbitrary real values (n >0 ) in the sense that the spectrum will be continuous ? and in that case, what is the orthonormality condition for eigenfunctions...

If white light were emitted from Earth's surface and observed by someone in space, would its spectrum be continuous? Explain.

Okay, I'm writing about optical spectrum analysers as part of my AS coursework, but I've been having some problems finding more in depth information on how they work. Can anyone explain to me how they work? Or link me to a website that can tell me? Thanks,

I have heard that the specturm for a BPSK signal looks like similar to the spectrum for DSBSC, but when I generate a BPSK signal and look at it on the spec an it does not look like DSBSC. I tried generating it with a Sig Gen using an internal square wave for the modulating signal and I also...

Homework Statement What does the line spectrum reveal about the energy levels in an atom? The Attempt at a Solution The energy levels are quantized is that right?

Homework Statement Ok guys, Helping my girlfriend out once again. She(if you haven't seen this before) is in Physics 101...yet, I(have taken all engineering courses) can't figure these out. Their book is absolutely terrible! Please give an answer that I can understand(as I like to learn...

I read that of what comes out of a polarized filter at 0° if we put one at 45° the output is 85% of the remainings photons. My questions are: 1) what is the selectivity curve of the polarizers versus the light spectrum ? 2) is the output coming out from the second filter depend on the...

Homework Statement Two identical particles are descibed by: H(p,x)= H(p_{1},x_{1})+H(p_{2},x_{2}) where H(p,x)=\frac{p^{2}}{2m}+\frac{1}{2}m\omega^2x^2 Separate to CM, obtain energy Spectrum. Show it agrees with: H\psi (x_{1},x_{2}) = E\psi (x_{1},x_{2}) with \psi...