Resolution Definition and 313 Threads

Hello there, I am trying to improve my understanding regarding spectrometers bandpass, resolution etc. For that, I went through the Ridchardson grating handbook and on Horiba’s website where they have a nice explanation...

Hello I've been digging around for high resolution photos of distant stars now for awhile. The search has been pretty difficult. If what I've been reading is correct then there appears to be a limit to viewing small objects like stars, if this is true can someone help me understand the reason...

I'm trying to understand why peak resolution changed in my alpha spectroscopy experiment. I've increased the distance between a Am-241 source and a silicon surface barrier (semiconductor) detector and taken spectra along the way, recording information about peak height and FWHM. As the...

I know localisation microscopy 'beats' the limit on resolution by activating individual sources and rendering a final image, but what are the limits that prevent the resolution of the images of these individual fluorophores? Is it just the number of photons collected? Cheers

Hello What does it mean when people say high resolution xray diffraction? What is the difference between regular Xray diffraction and high resolution X-ray diffraction? Thank you

Homework Statement The resolution of the eye is ultimately limited by the pupil diameter. What is the smallest diameter spot the eye can produce on the retina if the pupil diameter is 2.59 mm? Assume light with a wavelength of λ = 550 nm. (Note: The distance from the pupil to the retina is 25.4...

I am familiar with the derivation of the resolution of the identity proof in Dirac notation. Where ## | \psi \rangle ## can be represented as a linear combination of basis vectors ## | n \rangle ## such that: ## | \psi \rangle = \sum_{n} c_n | n \rangle = \sum_{n} | n \rangle c_n ## Assuming an...

Homework Statement A beam on Pions, Kaons and Protons, all with momentum ##\mathrm{P} = 10 \mathrm{GeV}## and negligible angular divergence travels ##100 \mathrm{m}## before hitting a target. What is the required timing resolution of the detector so that pions and kaons can be distinguished...

So I'm doing some research for a physics essay on particle accelerators and I don't want to go into too much mathematical detail (as I haven't studied statistics or higher level Physics at school yet), but I have googled a lot of things and nothing seems to come up for methods scientists are...

Hello folks, There is a wide variety of techniques to measure at the nanoscale. There are Scanning Electron Microscopes, Scanning Transmission Microscopes, Scanning Force Microscopes, STM... Also there are several devices used to analyze the Spectra of atoms: XPS, AES, UPS, HREELS... I...

Since, under rayleigh's criterion, the angular resolution is dependent on the wavelength of light, wouldn't blue light be more sharply focused by our eyes?

I was wondering if someone could offer an explanation as to why TEMs and SEMs have practical resolutions several orders of magnitude less than what is predicted by the Rayleigh Criterion. This of course comes from my own calculations of the Rayleigh Criterion assuming an electron is accelerated...

Wikipedia has this interesting article about a physics "paradox" that Einstein came up with: https://en.wikipedia.org/wiki/Tachyonic_antitelephone It shows that if you were able to send a signal faster than the speed of light, then you could send a message back in time leading to a causality...

Factor $30x^4-41x^3y-129x^2y^2+100xy^3+150y^4$. Please help me get started. I tried grouping the terms but still can't see any factorization that is familiar to me. Thanks.

I'm just curious as to how to go about factoring a polynomial like this one $6x^4+17x^3-24x^2-53x+30$ without using rational root theorem? Thanks

Homework Statement At first I needed to calculate the angular resolution of a telescope (diameter 1m, for visible light) so I used θ=1.22λ/D and got 4.88x10^-7 rad. Now I am asked: "If we wished to use this telescope to image the moon, what is the closest distance two objects can be to be...

Does anyone know if there is a way to determine the resolution of an optics system that is NOT diffraction limited. I know you can calculate the resolution of a diffraction limited system using the Rayleigh criterion, but that assumes the system is diffraction limited. Is there some way using...

Pardon my only basic understanding of physics. I'm not sure if the title is the correct question, but say I'm on a star many, many light years from earth. Can I theoretically see the freckles on my wife's face? It seems to me that light goes in all directions and the further it goes the less...

It seems to me that Gibbs' Paradox (that the entropy of a classical ideal gas, calculated by phase-space volume, is not extensive) can be resolved without assuming that particles are indistinguishable. Suppose instead the opposite: that particles are distinguishable, meaning that each one can...

Homework Statement Homework Equations θmin=1.22λ/D The Attempt at a Solution (a)θmin=1.22λ/D (b)θs=1.22(600nm)/30mm=24.4μm but what is spatial resolution and how to calculate it??

After successfully solving tons of problems about factoring polynomials I've buit up quite a confidence in myself. But it did not last long when I stumbled upon these problems Factor $3x^3-13x^2+23x-21$ $ 6x^3-2x^2-13x-6$ None of the techniques I knew were able to help me solve these...

Homework Statement Homework Equations θ =1.22λ/d The Attempt at a Solution for (a) θ =1.22λ/d θ =1.22(579nm)/(1.2cm)[/B] θ =5.8865x10^-5 degree= 1.027x10^-6 rad but the answer =2x10^-3rad , for the micorscope, the formula of angular resolution is different? i...

Hi all, If a camera images a fluorescent molecule gaussian function with diameter roughly 300nm and each image pixel represents 160x160nm how could you say with higher precision where the molecule is located within that pixel. For instance if the localisation precision turns out to be 40nm how...

Thinking and reading about the twin paradox recently, I encounter a lot of explanations and resolutions that don't make sense to me. At its most basic, the issue is- when two bodies are in different frames of reference, why shouldn't relativistic effects affect both equally, negating time...

Hi, my lecturer said that in PET imaging, the image resolution is superior when the E(max) of the positrons is lower. Why should this be? Thanks

Hello guys, thanks in advance for the help. I have come across a theoretical problem which I hope you will be able to help me solving. It is all base on resolution (Rayleigh criterion) and Nyquist sampling theorem connected to camera capabilities. So, resolution (Rayleigh criterion) is roughly...

Homework Statement [/B] Homework Equations Resolution lateral = 1.2λ f/dThe Attempt at a Solution R lens 1 = 1.2(750nm) (1/5) = 180nm R lens 2 = 1.2(750nm) (3/5) = 540nm However these are laterial resolutions. If it possible to find the depth resolution from this or am I missing a formula...

I am currently studying optical microscope and discover that the axial resolution is limited as r(z) = 2pi / (NA)^2. However, while I got hints that it is due to the Rayleigh's limit, I can't derivative the equation using numerical method. It would be huge thanks if anyone can help me on the...

I'm reading about detectors and seeing the term "electromagnetic energy resolution", but can't find a definition. Is this simply referring to the resolution of the energy of electrically charged particles? Or could it be to do with the resolution achievable through a particular method of...

Homework Statement 2. Homework Equations F-number is f/d x0 = 1.2λ(fnumber) The Attempt at a Solution [/B] Fnumber1 = 0.2 Fnumber2 = 0.6 x01 = 180nm x02 = 540nmThese values seem large for depth resolution, is this correct?

Hi the image below taken from http://www.gammex.com/ace-files/manuals/411LE_Users_Guide.pdf shows an ultrasound axial resolution phantom. I do not understand why the black dots on the phantom are stretched up-and-down in the ultrasound image. I do understand though why they get wider. Please...

So if we become a Kardashev type II civilization, able to harvest all the energy and matter in the solar system what could we see through the massive telescopes that would be possible to construct? (say with a lens the size of Saturn). Could you get surface detail on extrasolar planets, for...

Hello guys. I want to ask something about simple spatial resolution manipulating just by using c language. I have done my programming below, it managed to be compiled but for some reasons the program stucked in the middle when I try to run it. Really hope you guys can help. I am extremely...

Homework Statement why can't I resolve the forces in upward direction ? ( as in the sketched diagram) the book showed that the (y component ) forces are in downward direction ... why can't be in upward direction ? Homework EquationsThe Attempt at a Solution

To increase the resolution of an instrument, smaller wavelength and larger aperture is desirable. It is mentioned in some textbooks that the "effective" diameter of a telescope can be increased by using arrays of smaller telescopes. I just wonder why it is possible because every telescope is...

Bee Hossenfelder was live-blogging from Stockholm Conference on BH info puzzle today Tuesday 25 August. Herewith: http://backreaction.blogspot.com/2015/08/hawking-proposes-new-idea-for-how.html The conference is 24-29 August. Hawking presented his idea Tuesday, based on joint work with Malcolm...

Homework Statement How can I calculate the resolution of a pressure sensor used to measure hight ( altimeter ) ? We have barometirc equation ( refer to http://hyperphysics.phy-astr.gsu.edu/hbase/kinetic/barfor.html#c3 ) , and I can't find out the solution. Can the resolution be the same as...

Looking at Ben Krasnow's youtube video on breaking down the parts and general cost for a scanning electron microscope, he lists a raster scan generator, is that able to produce the highest resolution images still? Or is there another more modern technology for this purpose? Otherwise, how has...

Are there any high resolution observations of the gravitational lensing by dark matter, good enough to determine if dark matter is clumped or spread out at small scales?

Homework Statement Homework Equations θ=1.22 (λ/D) The Attempt at a Solution Just want to know if I properly answered this question. Thanks in advance

Hello, I am trying to understand the resolution of the following KdV equation. I try to demonstrate it by myself. The solitary wave solution is : At first, I created new variable as follows so I could transform the PDE into an ODE. A = A(p) p = g(x,t) g(x,t) = x - ct I succeeded to...

I started a thread previously (https://www.physicsforums.com/threads/time-dilation-happens-on-moving-frame-but-which-one.814622/) around this concept but it got closed by one of the staff after helpfully pointing me to...

I'm interested in watching videos of Real Analysis lectures etc. in good quality resolution. Those Harvey Mudd College lectures are valuable but annoying re video quality. Thanks. - Blue

Lets suppose I had a very powerful telescope and I could see 10 light years away. Would I see cars and people on that planet as they were 10 years ago? Would I actually see the people moving and the cars moving on the ground?

I checked some common commercial high-quality lab function generators and they seem to provide frequency output upto 50 Mhz (not a big deal), but with resolution of 1 uHz ! That means, they can generate signal with 50000000 Hz and also with 50000000.000001 Hz ?? That would equate to time-period...

Homework Statement An optical telescope has a diameter of 1.5m. It is placed at a site with 'seeing' of 1.0''. What is the expected resolution in arcseconds from observations made with the telescope at 1000nm? Give your answer to one decimal placeHomework Equations Theta (rads) = 1.22 *...

I'm curious about nanometer precision actuators, I wrote a short review of the Piezo actuator types I'm aware of here: http://41j.com/blog/2014/09/piezo-actuators-a-review/ But does anyone have any information on other actuator types capable of nanopositioning? Are there any electrostatic...

Science, unless I'm mistaken, tells us that electrochemical exchanges within our neural networks are what dreams and thoughts are manifested from. Problem is, to say that dreams are a manifestation of specific phenomena is to utterly refuse to say what the dreams literally are. How can science...

Homework Statement Hello Everyone! I just want to make sure I am on the right track. By smallest dimension do they mean wavelength used? An optical microscope is limited in resolution by the wavelength of light used. It cannot "resolve" matter, the dimensions of which are of the same order...

Hi, I am working on TDR (Time Domain Reflectometry). I send a 7GHz bandwidth fast rising edge (14ns) square wave into a coax. I get a return Signal. I have an ADC with 10Msamples/sec. I am using MPLAB IDE for coding the microcontroller. Now I would like to increase the Points on the...