Glass Definition and 658 Threads

Why does glass get elastic when immersed in HF; like this video? Hi, I was surfing YouTube and came across a very interesting video... Check it out yourself; http://youtu.be/gzUDjHDj0fQ" Why did the glass become elastic? I was thinking it might be due to destruction of some bonds...

Homework Statement In a double-slit experiment, He-Ne laser light of wavelength 633 nm produced an interference pattern on a screen placed at some distance from the slits. When one of the slits was covered with a thin glass slide of thickness 12.0 um, the central fringe shifted to the point...

Me and my colleagues are in disagreement over a question that appears on a paper. The question is-To which category does glass belong? A) Natural B)Metals C)Ceramics or D) Plastics. Although I am aware that Sand and Silica are natural products and glass can be created when lightning strikes. I...

When looking at my computer table, I notice that when i look at the glass from above it appears to be clear/transparent to all visible colors, but when I look at the edge of the table, the glass appears to be some kind of green color. Why does this happen, and why only this color?

Today I had the sink filled with water and some dirty dishes in. At the water surface, an empty glass was floating. I noticed that it wasn't standing perpendicular to the surface but it was tilted at and angle. I put i tperpendicular and gently let it free and it returned in the same position...

pkc111 Says: 10:09 PM Y If a wineglass can be made that shatters when a loud enough pure high C is played (because the resonace frequency of the winegalss is a high C).If a pure high C (just loud enough to shatter the glass) and an F (same volume) were played at the same time, would the...

Shortly: How is glass tube produced? I'm currently working on a project, in which I am planning to use glass tubes of sizes 1.5m length, 1.8mm thickness, 4cm and 5cm outer diameters. It will be cost effective to produce my own glass tubes when I start the mass production of the overall...

Hey guys, I think I know the answer but I wanted to confirm... Is it that a plane glass also separates light (internally) but we can't see it because all the rays get refracted back to its original angle when it comes out On the other hand, because the shape of a prism, light that exits a...

there is A , B and C A- is a small powered boat blade B-is a piece of 1 to 1/2 inch glass C- is the power (i don't know how it will power it yet) ------------------------ So how is it possible to have a motor send electricity though the glass to power the small blade? what would i...

In the following figure, the space b/w the glass lenses is filled with water. We have to find the focal length of the system (radii of curvature, refractive indices given) http://203.196.176.41/VLEBT_RootRepository/Resources/6c32207c-7c5a-4462-b90c-89b0c196bc72.gif Now to calculate the...

1. Homework Statement [/b] Consider a double-paned window consisting of two panes of glass, each with a thickness of 0.500 cm and an area of separated by a layer of air with a thickness of 1.75 cm. The temperature on one side of the window is 0.00 °C; the temperature on the other side is 20.0...

I would like to figure out if I take a circular piece of glass that is about 1/8 inch in diameter and crush it to 1/16 of an inch in diameter will I be able to use less energy to melt the same weight of material?

In my lab we have these glass viewing windows that are affixed to a combustion chamber. We've recently been experimenting with some new fuels that have some pretty nasty products of combustion. As a result, the windows have become "cloudy." At first, I thought it was just a nasty film...

Suppose there is a glass stopper with a hollow in it. If the ambient temperature rises the volume of the hollow(say 1cm3 initially) also rises. To find out the increase in volume, do we have to take into account the expansion of air along with the expansion of glass?

suppose one keeps a glass slab over a paper containing various colored letters, i kno the order of the height according to VIBGYOR, but what would happen if one of the letters is black? Will it be raised the maximum or minimum?

Homework Statement Please see here: http://img198.imageshack.us/i/unledev.jpg/ object placed 8 cm before the slab(6 cm thick,silvered at other end). The final image is formed 10 cm behind the mirror.Find refractive index of slab. 2. The attempt at a solution n is refractive index...

Hello I am a newbie to this site. Please help with my pool fence as three different tradesmen have just shrugged their shoulders! I have attached a photo. As you can see, it is frameless glass. It is safety glass 10mm thick and is held by clamps that work with tension only (no screw...

I was posed this question by a professor, and thought I would share with the online community! He asks, "if one were to use simple glass, how could they use it as a mirror, where 100% of the light is reflected?" The glass is transparent, but his hint was to look at a window! Whats your thoughts?

Please can somebody explain to me how and why light travels through glass into our eyes, as it doesn't in opaque objects?

Homework Statement A glass tube is closed at one end. The air column it contains has a length that can be varied between 0.50m and 1.50 m. If a tuning fork of frequency 306 Hz is sounded at the top of the tube, at which lengths of the air column would resonance occur? (Take the speed of sound...

I'm not sure which category of physics best suits light rays and what not so I just stuck this under general physics, many thanks to anyone who can help me with my problem! I want to project some words onto glass with a projector... What projector do I need? I was assuming something with...

Hi, I'd like to know what makes a http://tinyurl.com/4dp9ocl" better at starting a fires by focusing the sun light. Is it the magnifying power, it's size, it's thickness (etc.) ? Also, is there a formula to calculate it ? Thank you. -Philippe

Do wooden wall or window glass give good protection from penetrating radiation such as gamma rays?

Homework Statement At a marine animal park, Alison is looking through a glass window and watching dolphins swim underwater. If the dolphin is swimming directly toward her at 15 m/s, how fast does the dolphin appear to be moving? Homework Equations v=15 m/s I realize that due to the...

greetings, how does light travel through the glass? advanced thanks

Can anyone tell me why poly(ethelyne glycol) has a higher Tg than polyethylene?

Homework Statement The observer in the figure shown below is positioned so thatthe far edge of the empty glass is just visible. When theglass is filled with water, the center of the bottom of the glassis just visible to the observer. Calculate the height H of theglass if its width W=4 cm...

Hello All, One of my science teachers puts a glass rod in his coffee, but he won't tell us why... I was wondering if there was a physic/chemistry related explanation to this. He said that the effect did not occur before when he didn't put it in. Adding the glass rod ''solved the...

Homework Statement A hollow, spherical glass has an inner radius of R and an outer radius of 1.2R. The density of the glass is d. What fraction of the shell is submerged when it floats in a liquid of density ρ = 1.5d (1.5 times the density of the glass)? (Assume the interior of the shell is a...

Homework Statement Why is glass transparent to visible light but not infrared/UV?Homework Equations The Attempt at a Solution I know that it is opaque to UV and transparent to visible light because the higher photons are absorbed by the glass's electrons therefore letting the visible light pass...

Hi! A classic example in order to demonstrate the Photoelectric Effect, is to charge a metal plate (by electrons) connected to an electroscope and observe how the charge decreases when lightning by UV light. When put a pane of glass in front of the metal plate, we observe that the charge...

When a piece of red glass is heated to high temperature, it glows green. Similarly, when a green glass is heated to high temperature, it glows red. But How does a blue or yellow glass glow when heated? I could not find the answers for this when I browsed.

Question about Total Internal Reflection? My textbook says that for total internal reflection to occur 2 conditions need to be met. Light is traveling more slowly in the first medium than the second medium and no.2 is the angle of incidence must be large enough for no refraction to occur. My...

Question about Total Internal Reflection? My textbook says that for total internal reflection to occur 2 conditions need to be met. Light is traveling more slowly in the first medium than the second medium and no.2 is the angle of incidence must be large enough for no refraction to occur. My...

Hello, I came across something interesting on the internet. I saw an image in which a wine glass was half filled with water and put in the middle of the two different colored backgrounds. In the air portion within the glass, the two backgrounds were visible through the glass, however; in the...

Homework Statement A bubble in a glass of beer releases from rest at the bottom of the glass and rises at acceleration, a, to the surface in t seconds. How much farther does the bubble travel in its last second than in its first second? A) at B)(t-1)a C)(t+1)a D)(1/2)at Homework...

Homework Statement An ordinary drinking glass is filled to the brim with water(268.4mL) at 2.0C and placed on the sunny pool deck to enjoy. If the temp of the H2o rises 32.0C, how much water will spill out of the glass?Assuming no expansion for glass... Homework EquationsB=207*10^-6 for...

Homework Statement A steel rule is calibrated for meauring lengths at 20.00 C. The rule is used to mesure the length of a Vycor glass brick; when both are at 20.00 C the length is 25.00cm. What is the length of both the rule and the brick when at 80.00 C Homework Equations coef of glass...

1. The plane boundary between a sheet of glass and the air lies in teh x-y plane. There is a uniform surface charge density σf= 2.0μ Coul/m2 on teh surface of the glass. The permittivity of the glass is ϵg = 3.2ϵ0. The permittivity of air is ϵ0. The electric field in the glass is E = 3000 N/Coul...

Homework Statement Glass is transparent to visibile light under normal conditions; however, at extremely high intensities, glass will absorb most of the light incident upon it. This works through a process known as multiphoton absorption. In this process, several photons are absorbed at the...

Homework Statement In how many ways can 3 balls of different colours be put in 4 glass cylinders of equal width such that any glass cylinder may have either 0,1,2 or 3 balls? The Attempt at a Solution Using the formula for no. of ways for distribution of n distinct things into r...

Hi there! I was wondering: is it possible to break a glass using an electromagnetic wave at its resonant frequency?

I have always thought glass was reflective because all visible light falling upon it was absorbed, and only very little was reflected and able to make contact with our retinas, to little to be noticed, therefore making it transparent. I believe the opposite happens to mirrors, most of the...

Homework Statement This happened in real life, rock breaks through single pane safety glass and travels 9 meters, safety glass is 3 meters high. rock was 1 kg. I need to find the rough KE before the rock hit the glass. The MPa of the glass i am guessing is 50, google has yielded me little on...

Homework Statement A child decides to use a THICK (not thin) lens as a magnifying glass to look at a bug such that her eye is focusing on an image that is located at her near point, which you can assume to be 25 cm from the childs eye). The thick lens consists of radii of curvature R_1 = 5.0...

A typical mercury thermometer is made up of a thin, cylindrical capillary tube with a diameter of 0.0040 cm, and the spherical bulb with a diameter of 0.25 cm. If we DON'T Neglect the expansion of the glasas, find the change in height of the mercury column for a temperature change of 30 degree...

Homework Statement S solid uniform glass sphere is surrounded by air. The sphere has radius R and refractive index n. As shown in the picture, a light ray traveling in air, parallel to a diameter of the sphere, enters the sphere, reflects off the far side, then exits the sphere traveling in a...

This is a problem that my lecturer gave us in class and it has been bugging me ever since. I have been unsuccesful in finding or calculating a proper solution so I am hoping PF will be able to help... This is the Q: Let H be the height of a conical glass which is filled to a height h. Find...

Hi all, this has been bugging me so maybe you can help me out. In the front window of my house, there is a dent in the glass that looks somewhat similar to this: http://www.flickr.com/photos/guerra/2557095422/" However, there is not hole in the glass. But the shape of the dent is...

What determines of something absorbs light? Is it determined by the orbitals the electrons spin at, and what makes these two things special when other things like wood and metal don't