Resolution Definition and 313 Threads

Homework Statement In order to increase resolution of the diffraction gratings we can use them in higher orders of diffraction. What is the practical limit on using very high orders of diffraction? Homework Equations R = \lambda / \Delta\lambda = Nm The Attempt at a Solution I...

My main issue with this problem is the formula and how to derive it. Homework Statement The Hubble Space Telescope has a resolution of about 0.05 arc second. What is the smallest object it could see on the surface of the Moon? Give your answer in metres. Homework Equations I tried to...

1. Hi I am writing a program to calculate 3D vectors for visualization and I am testing textbook problems such as: "If vector c forms an obtuse angle with the 0Y-axis and is orthogonal to both vectors a = 3i + 2j + 2k and b = 18i - 22j - 5k Find the components of c if its norm...

I've been around and around on the net, and had two neuro-physiologists repeatedly dodge the question, so I open it to the wider population... When one speaks of learning one uses the phrase "adjusting synaptic weights", meaning (I presume) changing the strength of a connection between two...

Hi, I have developed a model that demonstrates the filling of atomic orbitals but need some 'constructive' criticism on its content. How do I go about that? I currently have it in a pdf format. Can anyone help?

Why are short wavelengths (of e.m. radiation say) required for observing the location of a small particle? Classically, I could imagine sending a wave train of light (or a photon) of different frequencies onto an atom in free space. Providing the electrons in the energy levels of the atom can...

May seem like a bizarre question but I was wondering what the maximum possible resolution of a scanned A4 image would be. A4 paper is 0.297m x 0.21m, average resolution of light is 200nm. So I get, (0.297m / 200x10^-9m) x (0.21m / 200x10^-9m) = 1.56 terapixels Is this about right...

Here are two exercises: 1. ) The proton radius is 0.8fm. What energy electron beam do you need for this resolution, if the target is liquid H2? 2.) A pion radius is 0,65fm. What energy pion beam do you need for this resolution by scattering on the electrons of a stationary target(pi-e...

Hi, I'm trying to find a high resolution ccd camera that can be used to take PHOTOGRAPHS to inspect the surfaces of metal cavities. It has to be compact and oblong to fit into a tube so it can be inserted into a cavity. I'm looking for something very much similar to this shape...

Hi there. I was wondering recently about the Fletcher's Paradox, and Peter Lynds' solution - the idea that time can't truly be measured in individual instants. Now, I'm not actually a physicist - just a science fiction writer. But has anyone proposed the alternate solution that motion is an...

Homework Statement hey, we just had our engineering math exam and one of the questions wanted us to resolve 3 force vectors (find the magnitude). I don't remember the exact values but it was something like F_1=1i-j+2k F_2=3i+j+3k and F_3=-2i+j+k all i could think to do was add up the i j and...

Hi, Can anyone help to explain the term of resolution in FTIR spectrocopy machine and... 1) If a sample A show a band centered 1650cm-1 and after some modify, the sample A show a band centered at 1652cm-1, can we consider the sample change in its molecular structure because it has a band...

Homework Statement A radio telescope observes two stars orbiting each other, using radio waves of wavelength 20.0 cm. The stars are 10^7m away from the Earth. The telescope, which has a diameter of 20.0km, can just resolve the two stars. What is the distance between the two stars?Homework...

Homework Statement From the shape of the Sun’s emission in the plot, estimate the resolu- tion of the telescope (the full width half maximum of the Gaussian shape) and from this calculate the size of the dish. The sharp bell represents the sun's emission and hydrogen is used as the...

Just two days ago I attended a lecture held by a professor at UiO who discussed the need to resolve the wave/particle duality model of light. He was unsatisfied by the deterministic approach to the problem (Bohr's principle). In general, he viewed the photon model as poorly defined and poorly...

Hi guys, I have a very simple question that arises in a photo forum in Brazil. Some guy put a formula to calculate the maximum resolution possible in a camera lens based on their aperture. The formula is 1800/N = (maximum resolution in lpmm) Were 1800 é a constant and N is the F stop of the...

Non-spatial resolution of quanta (split off from "Local realism ruled out?") I have taken the liberty of creating a new thread since this sub-discussion in https://www.physicsforums.com/showthread.php?p=2561841&posted=1" had diverged a bit from the OP. You distinguish two isomorphic...

Hey all, I'm sure this is simple, but I can't seem to find the answer in the Maple help section. When drawing 3D shapes, I want to be able to up the number of dots used to constitute the image, thus increase the resolution of the object. My spheres are showing up a bit boxy...

My new years resolution is to try to make some friends in real life. I have signed up for that meetup.com site and I'm trying to figure it out. There were 3 groups I was interested in - one has already broken up, another costs $300/year in membership fees, and the other is a walking group which...

describe two things that limit the resoultion of light microscope?

Hi I've been drawing surfaces in Mathematica but some of the images come out jaggy and very unsmooth. Is there a command that can be added that will increase 'resolution' or smoothness of the surfaces. Thanks

I know of resolving forces into components along x and y axes. But I have this issue. Consider a bob suspended from a string.The string is not perpendicular to the horizontal,but inclined at some angle(due some force,say it is in a non inertial frame). Let the angle be theta(with the...

Homework Statement the wavelength of the probing beam must be approximately the same as the size of objects we want to resolve. For each of the accelerators described below, determine the smallest size objects that are resolvable and name an object roughly that small, remembering that these...

Homework Statement Two red lights are separated by 5cm, perpendicular to your line of sight. How far away from them are you if they can just be resolved with the naked eye? Homework Equations angular resolution =sin(theta)=1.22lambda / D spatial resolution = 1.22(focal length * lambda)/D...

Homework Statement We were given six homework assignments for lab. We were required to find the force and angle through three given experiments. 1. Experimental using a force table 2. Graphically using head to tail, etc 3. Analytical using basic means to find the answers...

Imagine a double star with components separated by 10 astronomical units (10 AU). How far away can such a system be while remaining resolved with a 300 mm telescope? Show workings and give your final answer in either light years or parsecs. (Ignore atmospheric effects). Thanks.

Homework Statement Microscopes are inherently limited by the wavelength of the light used. How much smaller (in order of magnitude) can we “see” using an electron microscope whose electrons have been accelerated through a potential difference of 50 000 V than using red light (500 nm)...

Homework Statement I've got a diagram but here's the question. Two tugs A and B pull a ship along the direction XO. Tug A pulls the ship with a force of 30kN at an angle of 15°. Tug B pulls the ship with a force of 18kN at an angle of [theta] Find the angle [theta] Homework...

Homework Statement A mouse has an pupil diameter of 2.5 mm. lying 200 meters from the mouse are two stones 30 cm apart. λ = 500 nm a) what angle do the stones subtend? b) what is the MAR (minimum angle of resolution) of the mouse's eye. Homework Equations question a) tanθ = O/A O= 0.3 m A= 200...

What is the resolution of the black hole information paradox? According to quantum theory, information — whether it describes the velocity of a particle or the precise manner in which ink marks or pixels are arranged on a document — cannot disappear from the universe. But the physicists Kip...

From Rayleigh criterion, the resolution of microscope is given by \sin\theta = 1.22\frac{\lambda}{D} where D is the separation b/w two objects. Suppose D is constant, image and object distances are fixed, if we want to increase the resolution, we should increase the angle (theta) right? So...

Hello, I was wondering about this R-parameter that we have in Jet finding algorithms, what is it? How does it change the "physics" when we do jet findings in analysis? Any good introductory material would be really great if I could acquire it :-)

This is probably a very simple question, but the answer is surprisingly hard to find. I have a CRT monitor with a dot pitch of 0.22mm x 0.14mm x 0.26mm (Hor. x Vert. x Diagonal), and a max resolution of 1600x1200 (this is a 4:3 display). The viewable area is 18" which translates to roughly...

Hi everybody, I've got a problem with the Global Variables Plot in a 3D thermo-structural problem. I want to plot the reaction force for all the stored output times, but the interpolation only takes 7 steps of the solution, although the "times" in my time stepping are 0:.01:10 . In my opinion...

I've been thinking about this weird experiment for a while and came up with a couple of insights: * This experiment presents before us the paradox between our concept of time, and the photon's nature of living outside of time. For the photon, the idler and the signal were measured at the...

Homework Statement Force Resolution Question- 3 forces act on something, -a 600N force which is 50 degrees from the +x axis -a 300N force which is 85 degrees from the +x axis -a 700N force which is 50 degrees from the -x axis Resultant Force and angle The Attempt at a Solution Yes, very...

When I curl my hand up and look through it, even though I have terrible eye sight I can read the title of a book on my shelf even though I can't if I'm not wearing my glasses. Why is this? I just had a lecture on SNOM, (Scanning Nearfield Optical Microscope), where the lecturer made a comparison...

With DFT/FFT/SFTF or similar Fourier transforms, there's always a trade off between frequency and time resolution. It's like the 'uncertainty principle' for signal analysis. I have a few questions regarding this: 1: With a theoretical infinitely fast processor, is it possible to obtain...

Homework Statement A bag of sand weighing 100 N is hanging on the end of a long, light rope. The bag is pulled to one side by a horizontal force so that the rope makes an angle of 250 with the vertical. Find the magnitudes of the horizontal force and the tension in the rope.The Attempt at a...

I think I am right in saying that when we read a book, (for example), a photon hits the page and excites an atom, the electron that has been excited then returns to its previous state and in the process emits a photon corresponding to some energy band, (this defines the colour we see?). My...

can you help me in my Experiment Addition and Resolution of Vectors Questions 1- Compare the graphical and analytical (addition of components) methods for adding vectors. Which is more accurate? Give possible sources of error for both methods. Why is it useful to use...

Homework Statement Two point sources of light are separated by 4.91 cm. As viewed through a 12.1 μm diameter pinhole, what is the maximum distance from which they can be resolved if red light (λ = 690 nm) is used? Homework Equations sinθ = 1.22*(λ/D) y= L*tan θ The Attempt at a...

Homework Statement I'm not sure what I'm messing up here: "An American standard television picture is composed of about 485 horizontal lines of varying light intensity. Assume that your ability to resolve the lines is limited only by the Rayleigh criterion and that the pupils of your eyes...

Homework Statement The radio telescope at Arecibo, Puerto Rico, has a reflecting spherical bowl of 295 m diameter. Radio signals can be received and emitted at various frequencies with appropriate antennae at the focal point of the reflecting bowl. At a frequency of 200 MHz, what is the...

Is this the ultimate tool of a super power, and a cowardly solution to conflict? would not (kings) fighting (kings) be be the best solution to war.

Homework Statement I just want to get my concepts right again. How many times can a vector be resolved into horizontal and vertical components? In the case of a mass placed on a wedge, the weight of the body can be resolved into mg sin (angle) and mg cos(angle). Can this mg sin(angle) be...

1. Find the resultant of two forces of 40 lbs. and 50 lbs. acting at an angle of 60○ between them. 2. Three forces of 30 gms, 50 gms, and 60 gms respectively act at an angle of 120○ from each other. Find the resultant by rectangular-resolution (a) by making the 30-gm force lie on the x-axis...

Hi there! What is meant by saying that a photon of smaller wavelength can resolve smaller distances? I know from scattering theory that the form factor is the Fourier transform of the charge distribution and that knowing the form factor at high momentum transfers gives a better overall picture...

Homework Statement Resolve the following equation: log2 x + log2 [(x-3)/5)] = 3 Homework Equations Logarithmic laws: logc m + logc n = logc mn The Attempt at a Solution Restriction: (x-3)/5 > 0 x-3 > 0 x > 3 Resolution: log2 x + log2 [(x-3)/5)] = 3 log2 x[(x-3)/5)] = 3 log2 [(x2 - 3x)/5x]...

Problem: Centaurus A is 15 million light years away and a radio telescope can resolve structures of 1s of arc across. Show that the Structure is 75 light years across. Please Help!