Glass Definition and 658 Threads

I'm wondering how a glass dewar flask connects to a vacuum system, i.e. how is it vacuum sealed? Once it is sealed, I see how you can use appropriate flanges to pump out the, say, He gas, but how is a glask flask connected to this vacuum system? Thanks.

Refraction Problem:Distance Coin Appears to be in Glass Sphere Homework Statement A solid glass sphere with a radius of 5.00 cm and index of refraction of 1.52 has a small coin embedded 3.00 cm from the front surface of the sphere. For the viewer looking at the coin through the glass, at...

Refraction -- A light ray is incedent on a block of glass at an angle of 30 degrees Homework Statement A light ray is incedent on a block of glass at an angle of 30 degrees,what is the angle of refraction. Given: glass: 1.47 incident angle:30° Homework Equations π1 sin θ1 = π2 sin...

Hello All, I am new to this forum and would like to introduce my self as well as having question that has been in my mind for a while now. Please call me Kamto :o) I am not physicist so please forgive me if I am not knowing much about physics. Ok here is my question: I am planing of making an...

For a while I've used an IREX DR800 e-book reader, and in the course of my experimentations, I have observed that I can actually write directly onto the screen with a graphite pencil, and erase with a cotton t-shirt. I've been trying to find a larger piece of glass which yields similar effects...

Homework Statement Monochromatic beam of incident light on the surface of the glass wedge, whose upper edge is inclined at an angle of γ = 0.05 ° from the base. In reflected light observe a number of interference fringes, the distance between adjacent dark streaks is △X = 0.21 mm. Calculate...

Searched but didn't see a topic created on it, so here it is! https://www.youtube.com/watch?v=33wOKBMA2QA What does everyone think of this? Some Links:

My question is specifically with respect to holding LHe and using these containers as the environment for experiments (so not just for storage): Features to consider: Price Longevity Necessary associated equipment (I know this could be vague, but the LHe glass dewar would be surrounded...

Homework Statement A large cube of glass has a metal reflector on one face and water on an adjoining face (the figure). A light beam strikes the reflector, as shown. You observe that as you gradually increase the angle of the light beam, if Theta is greater than 58.7 no light enters the water...

A few years ago, I purchased a lump of glass from an estate sale for no other reason that it was beautiful and I wanted it. I set it on a shelf with the rest of my collectibles to collect dust. This morning at 8AM on the dot, the lump of glass shattered into a million pieces with a pretty loud...

Okay, here is a question that I have not been able to get answered. My Grandmother, when she was alive made crafts out of broken glass. The goal was to have broken glass with no sharp edges. These are the steps. First she would heat the bottle in the oven. Then she would remove the bottle using...

If you have an ice cube in a full glass of water when the ice cube melts will the water flow over, be the same, or decrease? My book says the answer is stay the same, but I can't figure out why. Ice was less dense than water which is why is floats. Using this equation: B = ρVg which when...

Hey, how would I start solving the total radiation transmitted through one plate, an air gap then another plate (double glazing) as well as the total convective heat transfer across the two plates? Thanks!

Let us say we have a very long glass that has a uniform square cross section. Its long axis is aligned with the x axis. A beam of light is directed along the y-axis such that it is normal to the side of the glass rod's side surface. When the rod is stationary wrt to the observer we would expect...

I have a pyrochlore antiferromagnetic system. In AC magnetic susceptibility measurements, there is a cusp at 4 K whose frequency dependence follows a spin-glass behavior. There is a cusp at around 5 K in magnetic heat capacity, also suggesting a spin-glass transition. But in neutron...

LINK1 LINK2 I bet we'll also have humanoid robots that are affordable (and bringing to the masses one of the few things only the wealthier have access to at the moment, i.e. servants/hired help), and also robotic cars that can drive themselves if you so desire it to.

Has anyone tried it? Do you feel that it helps you relax and focus or does it get in the way? For others who may not know, red wine has many health benefits and it is recommended to drink a glass or two a day.

Homework Statement Glasses have a variety of different refractive indices. Calculate the Brewster angle for a glass with a refractive index of 1.5. Homework Equations The Attempt at a Solution tan(θB) = n2/n1 tan(θB) = 1.5/1 θB = 56.31 degrees

Homework Statement Well, this is not really a homework question but something I wanted to find out. Basically, Why there is no deviation of light ray when it enters a semi circular glass block? Homework Equations The Attempt at a Solution I thought light ray would not be deviated...

Hey guys. What's a way that I could heat up glass to a temperature of about 200-600C without using combustion?

I'm doing a project on a water xylophone, and I have a couple questions about it. Please site your sources because we need all the help we can get. Thanks =D 1) How does the shape of the glass affect the sound the water produces. 2) Why does more water in a glass lower the frequency of the...

Hello there! I study communications engineering and got really fascinated by magnetic fields. I started to do my own bit of "research" or "further understanding" how magnets work, how the field is influenced and what can the field influence. After doing so I got fascinated by particle...

Homework Statement White light is incident on a sheet of glass as shown below. Complete the ray tracing diagram. Homework Equations n1(sinx)=n2(siny), where n = the refractive index of the medium. The Attempt at a Solution The ray on the bottom is hitting the glass at 90 degree angles...

Knowing that its possible to break a glass if you emit a loud sound at its resonant frequency. If you do the same for Human skulls, there will not only be a sound sleep, but a sound death too. Is that possible?

We know that the wavelength of visible light changes when it travels between two media with different refractive indices. Here's my question: does light change colour when it moves from air into glass? I had quite an interesting but inconclusive discussion about this with my Physics teacher...

Hi I have people heating liquids in sealed glass Schott bottles in our lab if they cannot find any metal containers in our lab. These are 1 liter bottles they are approximately filling to 500ml with very aqueous solutions. The bottles have not actually broken one, but Schott advises not to...

In solids it is the interaciton b/w the phonons and photons that give a lower effective speed. not absorption & re-emmision. (see ZapperZ's post: https://www.physicsforums.com/showthread.php?t=511177 ) but in amorphous glass there are [B]no[B] phonons. So why does light 'slow down'...

So I bought a magnifying glass for a project and I need to find out the focal length of it in order to use it. I'm given the magnification of the converging lens, which is 5, but I don't any methods or how I could find out the focal length given only the magnification. I attempted to set...

Hi I was just wondering what ways you can smash glass without physically touching/breaking/throwing something at it. For example, I know that the "force" of an explosion can break glass that is a fair distance away from the actual explosion. So is there any way you could make something that...

"Dancing" Pint Glass Not sure if this really should go here, as I don't personally think it was anything supernatural, though I do lack an explanation for it. I'd called into a local pub for a quick drink after work a few weeks back. It was pretty empty, just myself, the barmaid, and an older...

Hey, I recently bought my gf a ring and would like to put it in a glass bottle and allow it to hang by a fish line with it corked on top. I haven't found any wine bottles that allow the ring to just go in naturally, I have been having to heat all of them. I was wondering if I were to...

Hello, I'm trying to figure out what would happen if you put an explosive into a container of water where the explosive released the same amount of energy it would take to vaporize the water in the container. What would happen to the container?

Homework Statement The index of refraction of a glass rod is 1.48 at T=20°C and varies linearly with temperature, with a coefficient of 2.5 E -5 °C-1. The coefficient of linear expansion of the glass is 5 E -6 °C-1. At 20.0°C the length of the rod is 3.00 cm. A Michelson interferometer has...

Homework Statement A beam of light makes an angle of 26 o with the normal of a mirror made of 2.4- mm-thick glass silvered on the back. If the index of refraction of the glass is 1.50, how far is the point at which the beam leaves the glass surface (after being reflected from the silver...

Homework Statement A glass cylinder of radius R, length l, and density \rho has a 10-turn coil of wire wrapped lengthwise, as seen in the figure . The cylinder is placed on a ramp tilted at angle \theta with the edge of the coil parallel to the ramp. A uniform magnetic field of strength B...

Homework Statement I'm doing a lab, and I plotted a graph for the refractive index I got about 38.3 degrees and the material I'm working with is a glass block from reading two textbooks I came to the conclusion my graph might be wrong =/, because the critical angle for glass in air is...

As light travels from air into glass, it travels from an optically less dense medium to a more dense medium. This means there is no chance that at any angle, the light will hit the glass surface to be totally internally reflected since one of the requirements for total internal reflection is for...

SOLVED! Thank you!

When the cloth is pulled slowly, the glass moves with the cloth, when pulled faster, it topples. When jerked from underneath the glass, the glass stays put. Explain in terms of inertia and torque. I think I have the first and last part, I'm confused about why it topples, however. Any help at...

This is a simple enough question, but no one has been able to give me a satisfying explanation. Most people compare the momentum's of the bullet and the rock, and say that rock has a higher mass, so it's momentum is greater and it shatters the glass. I don't find this a convincing...

Homework Statement There is a point charge Q = 4π nC inside a glass sphere which has the radius 1 m and the dielectric constant εr=10. This sphere is enclosed in a hollow metal sphere with an inner radius of 2 m and a thickness of 0.5 m. The task is to find the amount of the electric field...

So my question is if I periodically heat some glass of liquid from an arbitrary source, hence providing a driving frequency for the system that will give rise to a phase lag between the temperature of the liquid and the incoming heat from the source, how can I show that there will be a possible...

Homework Statement "Light is incident from above two plates of glass separated on both ends by small wires of diameter d = .6um. Considering only interference between light reflected from the bottom surface of the upper plate and light reflected from the upper surface of the lower plate...

According to my understand of what makes something transparent, it's because a given wavelength of light doesn't have sufficient energy to raise the electrons in a material to a higher energy level, so the photons are not absorbed and continue on. This explains why glass is transparent for...

Hi, I run a window cleaning business and a free window cleaning magazine. As you will probably know window cleaners tend to use the properties of pure water and a water fed pole system in order to clean glass. Technique is important to a perfect finish so hydrophilic glass is our friend...

Dear all I have pooled the following facts or misnomers that I have heard or been told over the years about glass. Please comment on whether they are indeed correct and factual depictions of what is happening.1) You can see through glass because it does not absorb visible radiation (or absorbs...

Hi. Often, when I am a tour guide at the Museum of Glass, Tacoma,WA. glassblowing shop. I get a question for which I don't have a definitive answer. I thought someone might know What is special about glass that enables it to be formed by blowing? Which forces are the major factors in holding...

Homework Statement A person trips against a table, causing a glass to fall off the edge. An excellent human reaction time is 0.25 seconds. In that time, how far wil the glass fall? Assume that immediately (after 0.25 s has elapsed) begin to acclerate your hand so that you grab the glass when...

As shown in the diagram , why only ray 2 and 5 are considered? When ray 4 strikes the top interface from underneath, some is reflected. Why this ray is not considered?

Homework Statement I calculated some wavelengths for a wine glass I am using in an experiment and they came out in meters just like they should but the wave length out does the diameter of the glass(~9cm) by about 46cm... Is this ok or is there another way to calculate for a wine glass?Homework...