Glass Definition and 658 Threads

Glass is a solid? It is made up of molecules which is similar to what many other solids are made of? Then why is it transparent? Is it that the color of the molecules in glass are transparent and those in other solids are not? For that matter what is the color of molecules(atoms) in general?

Homework Statement Suppose a reflected white light is used to observe a thin transparent coating on glass as the coating material is gradually deposited by evaporation in a vacuum, Describe color changes that might occur during the process of building up the thickness of the coating...

I'm confused with a simple physical explanation as to why glass is so transparent. I would assume crystalline material would be 'more' transparent than glass since the lattice structure is ordered and light can pass through in an ordered manner. Normal glass is an amorphous structure...

Homework Statement A glass has a height of 10 cm, and a diameter of 2 cm, it weight 300g and a coefficient of friction equal to .30 exists. Will it slip or tip? Homework Equations ? The Attempt at a Solution Im almost certain there are no calculations informed since i have been...

Why the mercury in glass-laboratory thermometer doesn't stick to glass?

After doing a lot of reading in a business management class last semester, I noticed the glass ceiling plays a huge role in managerial positions throughout the world. However, I noticed that science and engineering industries are rarely mentioned during these articles, reports, etc.. My question...

Wasn't too sure where to put this as it is not actually homework. Anyway, I've been called upon to do a presentation on a material for prospective Physics students. I was going to do ferrofluids as they look extremely cool, but they want a material with a proper use, therefore I have chosen to...

Homework Statement What is the velocity of the water at the top of a glass of water? Is it really 0? For example, there is a lot of problems which asks with what velocity does the water would leave that glass if I make a hole on the bottom. For these, we consider the velocity at the top to be...

Hiya. I'm really stuck on the following question. I think that I have got part a alright, but I've no idea what to do for part b. Any help would be really appreciated. The refractive index of glass is 1.643 for blue light, and 1.618 for red. (a) Calculate the difference in the speed of...

Uhmm.. i faced some problem with my experiment of finding the thermal conductivity of glass..i hope that someone can help me. May i know the extimation of the thermal conductivity of a boiling tube?? isit the same as the thermal conductivity of pyrex glass?? when i want to find the radius...

For my Production and Layout II class I need to come up with a a fictional product I'm trying to sell in the ad. Getting to the point, I want to use a http://pomwonderful.com/pomTeaHome.html" glass as my container, but try as I might, I can't get the lable off the glass. Even with my Dremel set...

Homework Statement A glass of water with a mass of 500 g is being pushed horizontally at thetop across a table. The base is 1.5 cm in diameter and i is 5.0 cm tall. The coefficient of static friction is 0.20. Will it slip or tip? Homework Equations Not entirely sure.The Attempt at a...

I don't have a diagram for this, so I'm going to do my best to describe it. A glass tube lying horizontally has three different cross-sectional areas, A, B and C. Area A is 12 cm^2, B is 5.6 cm^2, and C is 6.0 cm^2. Mercury (density = 13,600 kg/m^3) is being pushed through the tube by a...

Homework Statement A glass cube has a small spot at its center. What parts of the cube face must be covered to prevent the spot from being seen, no matter what the direction of viewing? What fraction of the cube face must be covered? Assume a cube edge of 1 cm and a refractive index of 1.50...

Rubbing your finger around the rim of a wine glass produces a fine tone.It seems that my litle kitchen-table experiment produced 1000 Hz at a higt amplitude and the first overtone 2000 Hz had a small amplitude, 3000 Hz was higher and so it seems wiht 5000 Hz. So the even overtones are...

Hi to all! I have a little question for you. Does a b&w glass filter exist? I now there are all kind of color glass filters, but I want to know if there are any possibilities to generate a b&w image without using your camera or your computer. I know about the monochromator device, but it...

A little math help please. If I wanted to build a centrifuge to spin a glass disc 12" in diameter to test the thicker at the bottom myth, how many rpm do I need to get approx. 1000G at the edge of the disc? (I have been in an engineering career that doesn't require math for so long I forgot...

laser beam of dia=D strikes at theta.i an n.t=1.5 glass pane. what is the diameter of the beam in the glass... i started by setting up a geometric interpretation of the phenomena and concluded that the light would remain columned and both sides of the beam would simply shift from theta.i to...

Two non-parallel light rays initially converge to a single point on a screen. A rectangular block of glass is now placed somewhere in front of the screen, in the path of the light rays, so that the glass surface is parallel to the screen. Where is the new convergence point of the rays? 1...

Why Do Glasses Doesnt Have A Melting Point? And Are Glasses Liquid?thanks

This is my first time posting and need your opinions to help ease my wife's anxiety on a strange happening this morning. She went to bed last night, brought up a glass of soda, drank half of it and placed the half full glass next to the bed on the night stand. The alarm clock went off this...

THATS OUR RESEARCH TITLE AND IS THAT POSSIBLE ?:rolleyes: CAN YOU GIVE THE COMPOSITION OF BANANA LEAF EXTRACT

After heating some glass bottles to a very high temperature with a bonfire the bottles changed shape as you would expect molten glass to do, but once the bottles returned to ambient temperature they were extremely brittle. What is happening to cause this? I read that annealing requires heating...

Hi, can you help me to solve the following problem: :rolleyes: A narrow, long and glass tube opened first at both ends is dipped up to the half of its length vertically into a beaker filled with water. With a finger the upper end of the glass tube is locked and the entire glass tube is...

When we stir a glass or water, the dregs move into the middle of glass. Why?

Water in a glass pipe (pressure and volume) Hi, I have the following problem:we have a 1 meter long, thin glass pipe. It is open on both sides, we put that pipe 0,5 meters into a container filled with water. After that, we close the upper end which stucks out of the water, now we turn that...

OUTERSPACE! http://www.timesonline.co.uk/article/0,,2087-2242001,00.html" I guess the aliens did build the pyraminds:biggrin:

Does anyone know how ordinary window glass behaves at different wavelengths? It obviously passes the optical band, but does it pass ultra violet and infrared wavelengths equally well? How about wavelengths above 1000nm? Below 250nm?

# A convex lens placed between an object and screen forms a sharp image of the object on screen. A glass slab of refractive index n is inserted between object and lens. In order to obtain the sharp image on the screen again the lens has to be displaced by a distance x. What is the thickness of...

Sir, Please help me with this problem. # A small air bubble in a sphere of 8 cm diameter of a substance having refractive index 1.4 appears to be 2 cm from the surface when looking along the diameter. Find the true position of the bubble. I solved it in the following way: Here n1 = 1...

First of all i would like to apologise if i have posted this query in the wrong part of the forum. I just could find any other headings which seemed appropriate for my some what un-physics related question. Basically at school i fell backwards onto a pain of glass and shatterd/broke it to the...

# A rod of flint glass when immersed in carbon disulfide becomes almost invisible. It is said that it is because both have same refractive index. What I don’t understand is just because they both have same refractive index, why does it become invisible?

I was watching this news program about nuclear waste treatment plants in which the nuclear waste is somehow turned into glass logs. Would someone mind explaining this process-how would you turn nuclear waste to glass logs?:confused:

I would like to make some conductive, transparent, glass by somehow applying a thin layer of something [SnO2] to one side of a glass plate. I have seen this set of instructions, http://www.teralab.co.uk/Experiments/Conductive_Glass/Conductive_Glass_Page1.htm Which describes heating some Tin...

sphere in a cone (ball in a martini glass) A problem a friend mentioned to me years ago. You have a cone with height H and angle A. What is the radius R of a sphere that when placed in the cone, displaces the most volume? One suggestion was to reduce this to a two dimensional case.

I'm having problems with the following problem: A person who has a near point of 25.0 cm is looking with unaided eyes at an object that is located at the near point. The object has an angular size of 0.012 rad. Then, holding a magnifying glass (f= 10.0 cm) next to her eye, she views the image...

Hello everyone, i don't think I'm understanidn ghits formula correctly. THe problem says: The wavelength of yellow sodium light in air is 589 nm. (a) What is its frequency? I found, 5.09E14 Hz (b) What is its wavelength in glass whose index of refraction is 1.74? ? nm...

Does perpendicular incident light slow down through glass? When light travels through glass at a perpendicular angle, there is no refraction and hence no bending. If it slows down through glass, does that mean that red will emerge first and violet last?

heres the question: anti-reflection coatings on a glass lens (n=1.50) consists of a magnesium fluoride (n=1.38) film, the coating thickness is chosen to eliminate any back reflectionusing the ideas of destructive interference. What is the minimum coating thickness required to eliminate the...

How does the properties of glass affect its properties?? i am an As level student and i need some help on my material cousework. 1)How does the properties of glass affect its properties?? i know that the structure of glass is amorphous, and this make it very brittle...i want to know more...

I was wondering if there is a difference between trying to focus a beam of light through a think piece of glass versus a thin layer of glass?

If light reflects from all surfaces, why is the view through a glass window not noticeably dimmer than the view with the window open? Can someone give me som hint? I know glass has a refractive index of 1.5...

Hello all... This problem occurred to me the other day, so I decided to see if I could work it out, but am stuck. How much heat can be generated (in therory) using an ordinary magnifying glass to focus the sun's rays on a sunny day? Here's what I'm working with: A decent approximation for...

didn't know where to post it so I put it hereo:) do you guys agree with the following? http://encyclopedia.thefreedictionary.com/glass

Hey dudes and dudettes, loving the forum here. Will be around quite a bit for the next year or so hopefully.. Just a quick question, any help would be appreciated so much.. I'm doing my A2 main coursework, that's the one you do when you're 18 for all the American types, and was wondering...

How does he do it? http://www.compfused.com/directlink/1036/

imagine there is a spherical glass object with index of refraction N is that possible that for some N and angle of incidence A, the light will be total internal reflected forever. In other word, the light will travel within the object forever? i have been trying to proof it. but i don't know...

I have heard of terrestrial, gas giant, liquid and (speculatively) crystal planets. It seems to me that the conditions for forming a glass planet would be relatively common (more than those for their crystal cousins) - enough so that such bodies might eventually be detectable in our galactic...

Here a video of a guy pulling things (coin and saltshaker) through a glass table: http://media1.yourdailymedia.com/files/DZPQ111LeLiq.wmv http://img461.imageshack.us/img461/7786/japteleport0oo.jpg [title edited]

http://media.putfile.com/mindfreak-throughtheglass0-6500/480 I assume that the white paper is used as a frame for video trickery?