Attenuation Definition and 135 Threads

Hi all, using the mass attenuation coefficient and density, one can determine the percentage of X-rays absorbed in a material for a given depth, using the Beer-Lambert Law. e.g. The intensity of a beam of 8 keV X-rays will be reduced by 68% after passing through 70 microns of Silicon...

Dear folks, I'm a 3D computer graphics student, working on particles and fields area. As I'm a newer I have lots of doubts to clear on Physics topics. Please explain me what is Magnitude & Attenuation in Fields subject? I can see these two are common for most of the fields like air, drag...

Hi All, I'm reading about the attenuation of radio waves in space and I understand that, in addition to the normal attenuation that is proportional to the inverse of the square of the distance, there is also a loss due to the medium. This surprised me as I thought that there was no loss...

Hi, If we calculate the flux at a certain distance from a source of radiation by first neglecting the effect of attenuation in air, how does one factor in the effect of air attenuation? I do not know how to apply that theory. I'm am trying to understand what the difference is at sea level...

Hi, I am just curious; do EM waves attenuate in a vacuum? If yes, how does this happen? Also, how do they faint through a medium?

Dear All I am hoping for some insight into a transmission line problem I have been experiencing. I am quite inexperienced and unqualified in this area so if I am not clear please let me know. In wiring loom assemblies my employer offers there is a twisted transmission pair. The...

I'm trying to work out how much energy from sunlight will be absorbed (converted to heat energy) by a silicone polymer. I need the mass attenuation coefficient (from what I can tell at least) so that I can work out the amount of heat energy the water inside a black silicone polymer container...

I would appreciate assistance with a thought experiment I've been having trouble with. What I asked myself was, If I had two Lasers of equal Intensity/power, say 200 milliwatts, one appearing green and the other red, with wavelenghts of say 555 nanometres and the other 660 nm, which laser...

Does anyone know how to filter 60 hz down to -140 db all the notch filters I tried are about -60 db maximum but after I amplify the signal to 100db the 60 hz becomes a problem again. I need a filter for this it doesn't have to be one stage and also I need the 100hz, maximum attenuation on 100...

I need to know the practical applications of the absorption of gamma rays in materials.

Homework Statement I'm writing a school paper on the behavior of electromagnetic waves when they hit the interface between a non-conductor and a conductor. My question is if, in the case of partial reflection, it is correct to allow for both components of the wave vector (the wave is...

Hello, I'm attempting to analyse the data recovered from an experiment that I performed in lab, but I'm having some problems understanding how to properly apply the statistical methods learned to this specific problem. Essentially, the experiment consisted of placing a source of gamma rays...

The Problem I'm doing Salters A2 Physics coursework. Have chosen to do attenuation of projector slides but need some help with project variation. I feel that just finding an attenuation coefficient for the material that the slides are made from will give me few measurments and therefore not...

the mass attenuation coefficient is related to the maximum kinetic energy of the beta ray spectrum ( T max) by this equation mu subscribe m (symbol) = 1.7 / (1.14 T max) the problem here is that the denominator in my text is in the form of a matrix and as well all know a matrix doesn't give...

Exponential Attenuation and Beta Particle Range (solved) Homework Statement I am given a beta emitter and its atomic mass, as well as the atomic mass of its daughter, which have a difference of 0.0034 amu. I am to determine the range of the particles in air. Homework Equations I am given...

Hello everybody, actually yesterday i read about an experiment "ATTENUATION OF GAMMA RAYS". can anybody tell me what is meanning of word ATTENUATION.And why we are measuring it? i.e. what is the sigificance of measuring it?

Homework Statement Given... v\left(z,\,t\right)\,=\,5\,e^{-\alpha\,z}\,sin\left(4\pi\,\times\,10^9\,t\,-\,20\pi\,z\right) where z is distance (m), find... (a) Frequency (b) Wavelength (c) Phase Velocity (d) At z = 2m, the amplitude is 1 [V], Find the attenuation constant (\alpha)...

Hello everyone. I am trying to measure the position of a magnet moving inside a steel tube using a magnetic sensor on the outside. Eddy currents are causing errors due to phase shifts and amplitude changes. Any ideas? Can eddy currents be re-directed using selective copper paths? Since eddy...

Hallo to all, I have been reading a paper regarding electric pulse attenuation and the values are quoted in dB. The conversion to dB was done by multiplying the value with (20log10e) where "e" is the base of the natural logarithm. I see this conversion to dB fist time. I can not find any...

Homework Statement Show that the attenuation length, \Lambda, is just equal to the average distance a photon travels before being scattered or absorbed. Homework Equations my book gives: number of photons absorbed = \sigma\rho I(x) dx number of photons present after a thickness x...

Sound attenuation for my physics project I decided to investigate sound attenuation effect, for my equipment I’m using a speaker with a signal generator and at the other end a microphone with an oscilloscope...the sound generator and receiver were placed inside a tube which was well...

Sound attenuation for my physics project I decided to investigate sound attenuation effect, for my equipment I’m using a speaker with a signal generator and at the other end a microphone with an oscilloscope...the sound generator and receiver were placed inside a tube which was well...

I am looking at muons being lost as they travel through a concrete bunker (with various things inside). The minimum energy (mean) for a muon to go through the walls is about 1.82GeV, and for the stuff inside (flakes of magnesium) it is 2.7GeV. For a piece of heavy metal it is 0.13GeV (it's...

Homework Statement If a glass material has losses at 10^3 dB/km, what percentage of the original energy exists after moving 30m down the glass material. Homework Equations Intensity = Power / Area = (Energy / time ) / Area dB = 10 log (Output Intensity / Input Intensity )...

Hi, I am curious to know what is a typical numerical value for the attenuation coefficient of common optical fibre. Please don't include anything strange in the units like dB since I am new to that. Thanks.

Homework Statement Does alpha and beta rays obey the “Exponential law of attenuation”? Explain. The Attempt at a Solution I'm ashamed to be even asking this, but hey I am anyway. I was thinking that they do follow the exponential law of attenuation. However, I can't say that I'd be able...

\alpha =\frac {\omega \epsilon \prime \prime} {2} \sqrt {\mu \epsilon \prime} My question is what exactly does the \epsilon \prime \prime term signify?? I see sections of my notes that say \epsilon \prime \prime << \epsilon , but what is it? I mean when I am trying to find the attenuation...

Okay, the question I'm suppose to answer is: If the attenuation coefficent of Al is 1.73/cm for soft-xrays, what percentage of X-rays penetrate a piece of lead 3.00mm in thickness . . . What I seem to have is I = Io*e^(-ux) I believe u = 1.73/cm and x = 3.00mm. My 3...

Hi i am trying to understand how long a electromagnetic wave can travel... What is the attenuation that the electromagnetic wave face in the atmosphere... This question arised when i have read that marconni at the beginning of 20th century has sent electromagnetic waves from england to canadA...

Hi to all ... Reading yesterday about optical fibers i have noticed that the fibers have a small attenuation so they are suitable for long distances.. I was wondering where i can find a table that show materials and the atenuation they provide to electromagnetic signals... I am really peculiar...

I am going blank here... I have a high-pass 2nd order (butterworth) that has fc = 5500 kHz, fp = 7kHz and fs = 1kHz and asked for attenuation at fc and fp. I end up with more loss on passband than on stop band! I am actually not sure how to approach this. Any help is very very much...

Can anyone give me a good general formula or expanation for the diference in attenuation in a data signal in a network over a 500 and a 5000 foot cable? Help would be much appreciated. Thanx!

Hi everybody, I was wondering if somebody could help me find a chart or a table with electron attenuation lenghts or cross-sections in matter. I've searched the Internet inside-out but even if I would find something, it would be articles that you have to pay for :cry:. Still it seems a normal...

Hi there, first post from me - hurrah! I'm currently conducting an experiment measuring sound attenuation. I've got a table for the varying distances that measurements have been taken at, and the corresponding peak voltage values taken from a CRO. I understand that I have to take the log...

Hi, I'm using a software program called Maestro for an experiment on photon attenuation. We observed that different region of interets (ROI) gives different mass attenuation coefficients. Is there a way to determine the best ROI besides choosing it so that it's closest to the accepted coefficient?