Glass Definition and 635 Threads

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?

HI guys. I am facing a problem that is quite interesting but quite complicated to explain. so would like to ask some help. the problem is talking about the boucebackability of three different balls. Tennis ball , glass ball and rubber ball. there is one little boy claims that the glass ball...

What temperature does stone have to reach for it to turn into refractive glass?

We'd put this glass into cabinet. 1 day we suddenly heard a loud noise and then find the glass while it was smashed into tiny pieces. Any idea what's happened? I thought resonance caused that! :shy:

Just for fun, I used to play around with liquids, and I noticed something odd. In an uncovered tall glass container, ~20 fl.oz., I made an emulsion of water and olive oil by mixing and blowing bubbles with a straw. (Go ahead, laugh.) I let this sit undisturbed on a window sill for a while and...

A convex lens is placed on a flat glass plate and illuminated from above with monochromatic red light. When viewed from above, concentric bans of red and dark are observed. What does one observe at the exact center of the lens where the lens and the glass plate are in direct contact.

Hi, I have been looking at some discussion questions in a textbook and there is a question about blood transfusion from inverted glass bottle rather than a flexible bag. The question" What would happen if blood were transfused from an inverted glass bottle rather than a flexible bag? I...

Some help with this question please? a) An ice cube floats in a glass of water. When the ice melts, will the water level in the glass rise, fall, or remain unchanged? Justify your answer. b) If the ice had been made from pure water, and the water in the glass was salt water (denser than...

What is so special about a glass prism that a beam of light disperses after passing through it but not an ordinary cuboidal glass prism?

When we put a coin on a boardcard and both the boardcard and coin put on a glass. when we hit the boardcard,why the coin drop down into the glass.??

A 16 oz drinking glass half full of water shatters without any apparent help. The result is a mound of finely ground glass arranged neatly in a circle equal to the original circumference of the bottom of the drinking glass. Can physics explain how this happened? (No physics background here.)...

i can't figure this out. i hope someone here can. heres the scenario: the dishwasher was run the night before, and my sister emptied it at around 10 am. there are 2 sizes of the particular cups we are talking about here. she thinks she had stacked 2 big ones together, but there was a chance it...

I just saw an episode of Mythbusters where a guy succeeded in shattering a crystal glass with his unamplified voice. This guy tried on about twenty different glasses held directly in front of his mouth. Finally one shattered. They had him clocked at 550hz at 105 decibels when it finally...

Ok i don't know if this goes here or not but please let me know. Ok is it possible to have glass that has the strenght of steel but is still clear as in it's orginal state. Is this a possiblity? If so what is the cemical comp, i would like to know becase i am writing a book and would like to...

I saw CSI today and a glass was broken on the crime scene and furensics took one sample fracture from there and did one experiment in the laboratory also. (experimentor broke a window (glass) with baseball bat). And then they analysed those 2 fractures(one from scene and one from lab) and...

Do photons in the form of visible light actually pass through ordinary window glass? I ask because window glass is assumed to be opaque to photons in the form of infrared energy. The IR photons are accepted on one side of the glass, conduct through the body of the glass in the form of heat...

I am currently working on a research project aimed at explaining hardness variation of glasses with applied load (indentation size effect) and loading time (hardness creep). I am using the Vickers Hardness scale. My question (that hopefully someone here can answer) is what factors and...

Why doesn't it matter how far you keep an object when you are finding the displacement by the glass block

Glass-iron fibres could a magnetic field effect it? Hi, didn't know where to post this but basically if we were to have fibres made of a mixture of glass and Iron could an application of a magnetic field be used to apply a strain? What factors would need to be considered? Thanks

Hi, I generally understand interference and Newton's ring/Young's double slit experiments, but I can't find the answer to a pretty simple question: When two glass plates are placed together and their is a gap of thickness "t", contructive and destructive interference leads to interference...

why does the sound in a glass chnage as your fill it up with water? Hey everyone, does anyone know why the sound changes in a glass as you fill it up with water? I think it has something to do with resonance

Does anybody know the typical natural frequency of an empty wine glass? I want to conduct a demo experiment of breaking a wine glass with a sound wave from a distance. Has anyone here done it before? I need a signal generator (sine wave) and an amplifier. What kind of loudspeaker do I have...

Hi, could someone please help me get started on this problem. The figure is a right angle triangle with 30-60-90 degree angles (right angle). Can you help, please. Thank you so much. The glass prism shown has an index of re- fraction that depends on the wavelength of the light that enters...