Glass Definition and 635 Threads

Homework Statement A bead of radius R(=5 μm) is trapped by an optical beam and moved through a viscous fluid at a speed vd of 20 μms-1. If the viscous drag is given by Stokes law: F_{d}=6\pi \eta Rv_{d} obtain an expression for the laser power (intensity). If the process only has an...

Homework Statement I am a physics tutor. I want to show the relationship between electric charges and forces and gravitational forces. I am relating an example as follows. If we have a hollow metal sphere the size of the Earth with a charge of 1.63E15 C and a piece of tinfoil the surface with...

Homework Statement So there is some water inside a container; the height of water inside the container is l. I placed a wooden block on the water and it's floating to some height x, on top of the block is a metallic coin (see the diagram below). What will happen if I throw that coin inside the...

Can you make glass out of cubic zirconia, like you can with sapphire?

Pre-amble A glass rod with polished faces. Light goes in one end, and exits by the other end. We hear of light bouncing down fibre optics. What then happens with a glass tube, that has a rough ground inner and outer surface? Or worse... when a part of the inner diameter is 'hot melt enlarged'...

I can only find micrographs (photographs of microstructure under electron microscope) of non-transparent glasses. Is it impossible top be able to see the internal structure of a transparent material? If anyone can tell me what I'm doing wrong or find me one that would be great! I'm looking...

Would it be possible to use a 3D printer to print plastic (PLA for example) that could be smashed or warped by sound under 110dBs? I'm a biologist, trying to recreate what happens to hair cells in the inner ear when you damage them. Thanks.

Homework Statement what is the focal length of a plane glass ? Homework EquationsThe Attempt at a Solution place a plane glass in a plane and allow light to pass through it measure its focal length (i think its focal length is infinite )

Homework Statement A thin hair is placed between two microscope slides. When laser light is shined down onto the slides, periodic intensity maxima are seen to span the slides. Which of the following changes will decrease the distance between the maxima? I. Decrease the wavelength of the laser...

Hi,Guys. I have registered 2 spectrum's. 980nm induced spectrum of NaLaF4:Er3+ glass and NaLaF4:Er3+ ceramics. Now, i have to explain the observed differences. So the first one and obvious one,is that in the case of glass, luminescence bands becomes wider,because of the lattice structure of...

Homework Statement Unpolarized light is reflected internally in the point P in a glass prism. When the prism is located in air, β is the critical angle of total reflection. I am going to calculate for the following problems: a) If the prism is submerged into water the reflected light becomes...

Homework Statement A thin glass plate is pressed at the end of a glass cylinder. The glass cylinder with the glass plate at the bottom is dipped in water so that the plate is 25 cm under the water surface (The glass cylinder i open, meaning only the bottom part is closed, due to the glass...

Hello everyone! I happen to read this forum a lot, but I've never posted/became a member since I didn't have a specific question that wasn't already asked before or because I did not feel I had anything relatively original to contribute. So, I have a question to which I cannot seem to find an...

Hi, I'm far from a chemist / engineer but am looking for something that will react with glass and cool to around 40 deg F. Any ideas?

Hi everyone! Just wondering why when light hits glass it can pass through and be reflected at the same time. I'd like the classical and quantum explanation if possible. Also try to keep it simple. Thank you!

I'm an automotive technician working at a dealership and I am working on a car with intermittent issues with wireless communication with the tire pressure sensors which are mounted inside each wheel. I went searching for the location of the particular antenna that serves the tire pressure...

Hi everyone! for a marketing campaign we want to shatter ice or glass using sound - like when in films someone screams and all glass windows break..Is this feasible and how would you go by doing it? Any help would be much appreciated! Thanks :)

Homework Statement by taking the lower curvature as r1 , and the upper curvature as r2 , i don't know whether r1 is 20cm , r2 is 10cm or vice versa. But according to the ans r1= 10 cm , r2= 20cm . why is it so? Homework Equations The Attempt at a Solution

Homework Statement please refer to the photo, Homework Equations The Attempt at a Solution why can't I directly use the lens maker formula to get the ans ? my working is 1/f = ( (1.5-1.33) /1.33) x ( (1/20) + 0 ) ...finally , i get my f = -160cm. the radius of curvature of...

Homework Statement when the glass is partially cut( as shown in the photo ) , the centre of curvature is inside the denser medium (glass), so the centre of curvature should be lower than point Q in the diagram . am i correct? by saying that the centre of curvature is inside the denser medium...

Hi All, I would like to ask if what supplier's fabricate Low Coefficient of Thermal Expansion (CTE) glass tubing for Fiber Optics application. or What type of glass do we need in Low CTE? It will serve as the packaging for DWDM components. Hoping for your response. Thank you.

Not sure if I'm putting this in the right place, but here's my issue: I'm putting a ultrasonic transducer against glass to try to vibrate/move water on the other side of the glass. I can get enough power through the transducer to physically move the glass, yet I still can't get water to move...

Can combining a magnifying glass and a prism make a rainbow capable of ignition?

Hello, I am choosing glasses for a novel solar cell design, and part of the criteria is if the glass will be able to withstand hail and other things (?) falling from the sky, since this glass will be the cover glass for the entire solar cell. I can gather information on the glass including...

A double-slit experiment is set up using a helium-neon laser (l = 633 nm). Then a very thin piece of glass (n = 1.50) is placed over one of the slits. Afterward, the central point on the screen is occupied by what had been the m = 10 dark fringe. How thick is the glass? I have the solution's...

when you slide your thinger around the rim of glass it produces resonance the matter which vibrates is a glass, not air, right? i understand that when ou hit a glass once it produces sound as by hitting you displace mass of glass from its equilibrium. but why sliding the rim produces sound...

I always see in many books and articles. Glass rod is used for decantation. Why should we not pour the liquid just directly. I asked my chemistry teacher. She told me to experiment myself by decanting two identical heterogenous mixtures, one using a rod and other without one. Please tell me...

Hi everyone I have been working with singing wine glasses and the A.P French equation - I was just wondering if there is a value or way to work out the value of the constant in the equation? I have a basic understanding of physics but yeah haha... Cheers guys

Why does water get that shape when poured out of a glass, almost like the nodes and antinodes of standing waves in a string? Also, the 'parts' of water (For want of a better term) seem to be perpendicular to each other, alternatively. I really think I'm doing a bad job of explaining this, if...

A ray of violet light enters a 60° glass prism at an angle of incidence of 40°. If the refractive index of the prism material for violet light is 1.651 calculate: (a) The angle of refraction for the air-glass boundary (b) The critical angle for violet leaving the glass (c) The...

Homework Statement A logo is embedded in a block of glass (n=1.52), 3.2cm beneath the top surface of the glass. The block is put under water so that there is 1.5cm of water above the top surface of the glass. The logo is viewed from directly above by an observer in air. How far beneath the...

Homework Statement How do you explain that crystalline melting temperature Tf of PE is greater than the Tf of PEO? How do you explain that the glass transition temperature of PP is lower than the glass transition temperatures of PVC and PS? Homework Equations None The Attempt at a Solution...

suppose the white light is incedent on a red glass. Behind the glass we see only red light and glass gets warmer. how exactly white light transformed to red light. Does that mean that the material of the glass absorbs all wavelengths (theoretically) except of the red region? If so what the...

Homework Statement A magnifying glass has a focal length of 8.0 cm. How close to an object do you need to place the magnifying glass so that the distance between the image and the magnifying glass is the same as the focal length? What type of image is this and what is its magnification...

I'm starting with the Einstein box. It's the one that's floating in space and has photons moving from one side to the other. The idea being that every time a photon is sent from one side to the other, the recoil sets the box in motion until that photon strikes the other side breaking to zero...

Hello Guys! I have been studying electromagnetic waves (EMW) interaction with matter lately and I just derived the results for the propagation of EMW inside linear media and perfect conductors. As it turns out, when a plane EMW changes medium (at a normal incidence) from air to (good)...

http://www.glassalchemy.com/media/upload/image/stressfig1.gif In the manufacturing of glass(flat glass),the outside cools first followed by the inside.So,this means that the outer surfaces compresses on the hot inner surface.What I don't understand is how the tensile stresses are developed on...

I like Google glass. What type of engineering major is most appropriate to get to work on similar type of projects? My guess is computer engineering/science, what do you think?

Homework Statement A flint glass plate 3.5 cm thick is placed over a newspaper. How far beneath the top surface of the plate would the print appear to be if you were looking almost vertically downward through the plate? Homework Equations N=1.66 for flint glass Apparent = d/n The...

Homework Statement I understand the basic formula per say of the apparent shift due to glass slab (t(1-1/u)) But when a question comes on i just don't know how to proceed. For ex this question came on my test and i just couldn't visualise how to make ray diagram or even attempt it.Homework...

Homework Statement The dispersive power of glass is defined as the ratio \frac{n_{F} - n_{C}}{n_{D} - 1}, where C, D, and F refer to the Fraunhofer wavelengths, λ_{C} = 6563 \stackrel{o}{A}, λ_{D} = 5890 \stackrel{o}{A}, and λ_{F} = 4861 \stackrel{o}{A}. Find the approximate group velocity...

If a light goes from space to a glass his wavelength becomes smaller.So if we put a red color to a glass it can become orange?

Hello everybody, I want to determine the extinction coefficients of Fe2+ and Fe3+ in glass. There are literature data (e.g. Weyl's book "coloured glass"), so I know what kind of curves I should expect. As I am studying a slightly different soda-lime-silicate system, I want to recalculate the...

i am just being curious about some details about how laser can induce charges inside a glass bulk? Does anyone else have more knowledge on this?

Hi guys, I'm new to this forum... I was just reading the link given below,posted by ZapperZ, describing as how photons propagate in the form of phonons in medium like glass... https://www.physicsforums.com/showthread.php?p=899393#post899393 and a question it struck to me, In the last...

Homework Statement a) Find the frequency of vibration under adiabatic conditions of a column of gas confined to a cylindrical tube, closed at one end, with a well-fitting but freely moving piston of mass m. b) A steel ball of diameter 2 cm oscillates vertically in a precision-bore glass...

Light Slower In Glass ?? so light is slower in glass, but why i know its something about that when a wave of light hits atoms the move around and produces more waves of light and then the super position of them then slows the original light somehow, but i don't understand why and how and...

http://www.cnn.com/2013/07/11/world/space-blue-planet/index.html?hpt=hp_t1

Hello! I'm new to the forums, have SOME physics under my belt as a civil engineering major. I have a hypothetical question to solve that has been driving me bonkers. At first, it sounded simple enough. Now, I must assume MANY things and don't know which set of equations to use to solve my...

Hi all, I have been researching conductive glass in my quest to create a solar powered 3D printer :) :). So, I have contacted a few manufacturers in china who sell ITO glass, but it is still a little pricey, and I was wondering what the forums thoughts are on making my own ITO glass. I have...