Microscope Definition and 252 Threads

Suppose you have a bucket filled with superfluid Helium-4 and you spin it with a large angular velocity Ω, the bucket obviously has angular momentum. Spinning fast enough, the fluid develops irrotational vortex lines which carry quanta of angular momentum, while leaving the curl of the ∇xv 0...

Hi! I am creating this thread to ask what is the physical phenomena that drive the smooth disengagement of clutch discs from flywheels. I am thinking about car clutches, specifically a longitudinal front engine, rear wheel drive clutch type. I've been reading some books that describe the...

Suppose there is a set of twenty tiny radio sources that are distributed randomly in an area of 1 mm2. What is the best way to locate each of these sources - as in identify them and their locations? We can suppose that all of them are of the same frequency of 1 Mhz. Thus if the radio telescope...

Hey, guys, I have just watced a fantastic animation of the microscopic process of sound wave traveling, in which model was described as many balls connected by springs. But the problem is what we learned in thermodynamics chapter is that there is no bonds between molecules in gas, then how...

At least according to this article, https://nz.news.yahoo.com/a/-/world/24765825/extra-terrestrial-life-discovered-in-outer-space/ An interesting find, to say the least!

The following passage has been extracted from the book "Modern's abc of Chemistry": Lets fill an isolated atom by subatomic "Rutherford projectiles"-alpha particles. I hope it is possible. This doesn't seem to be a limit of our technology. Isn't it? If we are successful in...

Homework Statement A small sphere, with initial temperature ##T##, is immersed in an ideal Boltzmannian gas at temperature ##T_0##. Assuming that the molecules incident on the sphere are first absorbed and then re-emitted with the temperature of the sphere, determine the variation of the...

I know, it sounds a little more epic than it really is. It is true, however. I am in the process of writing a story and would very much like to have the specifics of the other planet described at one point to the reader so they can get a grasp on the world part of the story is taking place in...

[SIZE="4"]Definition/Summary The double-slit (or 'two-slit') experiment clearly demonstrates that individual particles exhibit a wave-like behavior, in that an interference pattern can be shown to build up over time, despite the presence of only one particle in the experimental apparatus at...

[SIZE="4"]Definition/Summary In thermodynamics, internal energy, U, is the energy associated with the microscopic energies of a system, that is with the energy associated with the random motion of the molecules within a system. More generally, while external energy is energy due to...

[SIZE="4"]Definition/Summary Heat is the non-mechanical exchange of internal energy, U, between a system and its surroundings as a result of a difference in temperature. By contrast, work, W, is the mechanical exchange of energy as a result of force applied across a moving surface (such as...

Definition/Summary Diffraction of a wave is the spreading or reflection or apparent bending when it encounters an aperture, obstruction, or opaque edge. Diffraction by an evenly-spaced series of apertures (a diffraction grating) causes interference patterns and has the same bending or...

Hi all! I am currently conducting an investigation into the way in which frequency varies when you change the tension on a guitar string. I am aware of Mersenne's laws, and that frequency should vary in square root proportion to tension. I'm looking for an explanation that goes beyond simply...

I think I understand how pressure works with gases. More molecules bouncing around -> more random impacts -> stronger force. But I realized to my embarrassment that I don't understand how solid things press on each other, microscopically. Say I put a block of iron on my head. If I put...

Dear friends I have been working on a new way of illuminating microscope specimens. Cannot disclose the innings of it since all is under development. Nevertheless I attach photo since I think you will find it interesting. That is the mouth of a honey Bee, photo compares standard bright-field...

I read that essential oils can go through the skin. I am told that there are more water molecules in just 10 drops of water than stars in the whole universe, so if they are so tiny, why don't they go through the skin membrane pores, which are perfectly visible under an optical microscope? You...

Hi all, I've been reading about biconvex lenses, drawing ray diagrams and real/virtual images. I'm now trying to translate this into how an image is formed in a compound infinity optics microscope. And this has raised some questions: -In an infinity optical system the object is placed at a...

Homework Statement A rubber band at temperature ##T## is fastened at one end to a peg and supports from its other end a weight ##W##. Assume as a simple microscopic model of the rubber band that it consists of a linked polymer chain of ##N## segments joined end to end; each segment has length...

I have been thinking about the Maxwell equations lately and was wondering about their "natural" differential form formulation to get some nice geometric interpretation. This post mainly concerns the inhomogenous microscopic Maxwell equations on some spacetime ##(M,g)##, as the homogenous ones...

Let us consider a quantum wave of one very energetic particle, stored in 100 microscopic jars. There's some lock mechanism that keeps the jar lids on. Then we open all the locks simultaneously. How many lids fly off? One? All?

Hi awesome people at physicsforum, I'm interested in understanding light and optics such that i can understand the basics behind the different types of microscopes (phase-contrast, light microscope, electron emmision etc.). I'm not so interested in the math and calculations, more in the...

It has been quite some years since I last used quantum chemistry software. Now I would like to use some program which allows the calculation of the microscopic omega and k-dependent dielectric function (tensor) for periodic crystals. Any proposals?

Hello, In CFD computation of the Navier-Stokes Equation, is stress tensor assumed to be symmetric? We know that in NS equation only linear momentum is considered, and the general form of NS equation does not assume that stress tensor is symmetric. Physically, if the tensor is asymmetric then...

Hello everyone I need to ask in a Hand Held Fiber Optic Microscope what should I see when the fiber is considered burnt or distorted ??

Homework Statement Electrons are accelerated by 2450 V in an electron microscope. What is the maximum possible resolution? Me=9.11 x 10^-31kg and e= 1.60 x 10^-19 C Homework Equations I'm not so sure which equations to use for this question.. maybe the Planck's formula? λ=h/p...

Homework Statement Suppose we have a microscope made out of two lenses, both with a focal length of 25mm, placed 36.5mm apart. Find how far in front of the first lens should the object be placed to assure that the image is magnified at least by a factor of 75? Homework Equations The...

These are some pictures I have taken through the microscope. All of the pictures are of recrystalized ascorbic acid except for the last two. The last two are of NH4 with perchloric acid (clear crystals) and chloroplatinic acid (yellow) respectively...

On a whim, I started looking at microscopes on ebay today. I don't really know anything about them though. I'm an amateur astronomer, so I know all about telescopes, but in microscopes, I wouldn't know what to begin to look for. I found this one that's just under $300. It says it will go from...

Would the resulting image by a scanning electron microscope be different if it scanned across the y-axis? SEMs have deflecting coils that move the electron beam from left to right (x-axis) rapidly while traversing down the y-axis to cover the entire specimen. Would the image you get after...

Homework Statement "One microscope slide is placed on top of another with their left edges in contact and a human hair under the right edge of the upper slide. As a result, a wedge of air exists between the slides. An interference pattern results when monochromatic light is incident on the...

Hi I am trying to run a FRAP (fluorescence recovery after photo-bleaching) experiment but I am struggling a little bit. For those not exposed to the technique it involves, for example, bleaching a spot in a specimen that is fluorescing rendering that spot dark in contrast. I have two separate...

Homework Statement At this site http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/micros.html , what does the negative sign indicate in the Mo formula? Homework Equations On website The Attempt at a Solution My guess is that either L or Fo are negative, but a negative magnification...

I came across http://hyperphysics.phy-astr.gsu.edu/hbase/geopt/micros.html Any idea what the negative sign indicates in the mo equation?

Is it posible to make a telescope using water drops? (water drops are to be on transparent plastic or glass, set at desired distance; convex lense is a free drop, concave is a water drop in a ring (because of surface tension))

Hello everyon, Sorry if this is the wrong sub forum but I thought it would work. I am trying to photograph carbon nanofibers with a microscope (I don't need it to be too fancy). I am in the range of 200-600 nm and I cannot measure them too well with the 40x lens on the University's...

Homework Statement Hi. I'm required to calculate the magnification of a microscope with the variables given. I have calculated this, but was just wondering if the best viewing distance is bigger than the length of the microscope, would this have any effect? Homework Equations N/A The Attempt...

I have a small question. I am using coumpound microscope with video attaced and I got using 40X times objective and 10X eyepiece that my magnification on video screen is 1000 times.I know that between eyepeace and video system where is a beam splitter and between beam splitter and video screen...

[FONT="Trebuchet MS"]Has anyone worked out a functional Parametric chart that enables one to choose a appropriate Microscope (exclude Scanning electron MicroScopes(MS)) amongst the multitude of choices for a modern academic micro-biological & research lab, hence formulated a general guideline...

describe two things that limit the resoultion of light microscope?

I'm using a confocal optical (reflection) microscope to look at cryo (cold) specimens (held at below -20C). The objective is 1.4 cm from my sample, and separated from it by a couple of layers of glass, BUT NONETHELESS the light is melting away the ice in my samples, damaging them within 5-10...

Homework Statement If the field diameter on 40X is 1600 µm, and a specimen takes up one quarter of the field, how big is the specimen in real life?Homework Equations Magnification of image= Image size/ Real size of objectThe Attempt at a Solution I'm not sure but in the formula, would be put...

I was reading about Dr Royal Rife and his universal microscope there and the author of the article claimed that universal microscopes can be used to view viruses without killing them like electron microscopes do. Is this true? Also are these universal microscopes still in use today? Before now...

Homework Statement A compound microscope has a length of 25 cm. The objective lens has a linear magnification of -20cm, and the eyepiece has an apparent magnification of 10, what are their focal lengths (fe and fo)? How close to the objective lens should the object be placed for viewing the...

Biology -- Calculating Resolving Power of Microscope?? Homework Statement The question is this: Resolving power is a function of the wavelength of light used and the numerical aperature of the objective lens. Given that RP= wavelength / (2 x NA), calculate the resolving power of the...

I have a question about Heisenbegs gamma-ray microscope and observed electrons. In this example is it so that we observe the electron only in limited angle of aperture θ. So the remaining electrons which scatter the gamma ray outside the aperture θ are not being observed at all? What...

I have made a micrscope for a class, and now i have to explain how it works. I followed the lens layout from this website http://www.funsci.com/fun3_en/ucomp1/ucomp1.htm, and I don't understand why I have the plano-convex lenses oriented the way they are. Basically in the objective I have two...

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...

Homework Statement The near point of a naked eye is 25 cm. When placed at the near point and viewed by the naked eye, a tiny object would have an angular size of 5.2X10-5 rad. When viewed through a compound microscope, however, it has an angular size of -9.20X10-3 rad. (The minus sign...

Hi there, Anyone know what is highest resolution of modern microscpe? And what kind of this microscope is? Where can I get the related information?

Microscope Theory - Alternatives to the use of visible light? Hey guys. I've been googling for ages but I've had no luck with this so I thought you guys could help me figure this out. Why can't UV light or gamma rays be used to observe objects in microscopy? I know the main idea behind the...