Glass Definition and 635 Threads

Dear all, here's my first request for a little help (maybe also in finding the proper subforum...) I'm working as developer and scientific consultant in a lab for Nuclear Magnetic Resonance at high field (> 21 Tesla), and I have to create a suitable probe for checking the stability of a...

Homework Statement A lens having a focal length 50 cm is used as a simple magnifier. What is the angular magnification obtained when the image is formed at the normal near point (25 cm)? Homework Equations 1) m = N/d, where d is distance of object 2) m = 1 + N/f The Attempt...

[FONT="Arial"][SIZE="4"][SIZE="5"] Are there any figures available for shear stress of annealed and toughened glass?

If atoms can only emit certain photons , like hydrogen has only certain spectral lines in the visible spectrum , then how come when i shine pretty much any color of light through glass it hits the atoms in the glass and then re-emits them , what are the spectral lines for glass (silicon...

There are a lot of youtube videos and online forum speculations that suggest that tossing a disassembled spark plug at a car window will cause the window to spontaneously shatter. The supposed justification is that tempered glass can easily withstand from softer materials than it (such as the...

Do any of you design engineers or informed laymen know why progressive tint window glass like that found in eyeglasses is not offered as an option? Aftermarket provides tinted glass but not progressive tinting. I must wear tinted glasses outdoors due to light sensitivity so I wear progressive...

Homework Statement A fine hair separates one end of two pieces of flat glass to form and air wedge.when light of wavelength 670 nm is incident normally, 25 dark bands are observed (with one at each end).How thick is the hair? Homework Equations destructive interference: 2nt =...

I am having trouble trying to work out where an object should be placed with regards to a magnifying glass. Should it be located between the lens and the focal point F to create a virtual image? many thanks?

Hi all, I'm doing some theory for my research, and I'm stuck! I'm trying to figure out why the absorption spectrum peaks at 420nm for silver nanoparticles. I know that this is expected for silver--I understand conceptually what's going on... but am trying to show it mathematically. I'm...

Homework Statement A light beam incident on a glass slide at an angle of 60 ˚, being partly reflected and partly refracted. It notes that reflected and refracted beams are each at 90 ˚ What is the refractive index of glass? Homework Equations n1sinσ1 = n2sinσ2 The Attempt at a...

Why does long wavelength infrared not penetrate glass?

I know the question sounds a little bit noobish but If you place a CD on a clean glass table seems like the CD is floating. There's vacuum between the CD and the glass stopping you from picking it up yet the CD seems to be floating. If not I would like to know what other forces could be acting...

Hello, I work for a container factory where re-used bottles have a lot of tiny glass splinters. Inspired by the standard experiment of picking up glass splinters using a comb, I thought I could insert a charged rod into a bottle to attract little splinters towards it. To get similar voltages...

Could a powder of praseodymium glass be used as a yellow-green pigment, which have historically been rare and very lightfast?

Soils, mud, dirt "Sticking" to glass? Hi all, First of all, please feel free to move this question wherever it should go. I truly have no idea if I'm looking in the right place at all, just a point in the right direction would be greatly appreciated. My question: For a project I'm...

Can glass eye sporters move their glass eye similar to their good eye? Or are modern glass eyes still immobile?

Bit of a silly question I know, but I have never been able to get answer which I'm happy with. I thought it might be due to the energy levels available to the electrons in the glass. Light is able to pass through the material, because the photons in the visible part of the spectrum don't have a...

Homework Statement A 2.0 mm diameter glass bead is positively charged. The potential difference between a point 2.0 mm from the bead and a point 4.0 mm from the bead is 500V. What is the charge on the bead? Actual Answer 4.2*10^-10 I am unable to understand or even get near this...

glass as an insulator? i have lately done some reading on the properties of glass and have seen threads where some say glass is an insulator and others say it isn't. what is the real fact about the thermal conductivity of normal glass, e.g. the wine glass or the glass beaker. are they really...

Hi, It's come to my attention that one can use glass as a lubricant for hight temperature metal working operations. I'm very interested in this could anyone please give me any information about this, papers, articles and book references as well as a company I can get these glass coatings...

http://www.physorg.com/news184310039.html On the company's website it states; Certificates and expert’s reports by accredited independent institutes and labs have documented the following properties: * Physiological harmless * Food safe * Compatible with skin and mucosa * Free of nano...

Homework Statement Parallel light rays travel from air towards a glass hemisphere with radius R and index of refraction ng > nair. A top view is shown in the figure. http://img8.imageshack.us/img8/6380/parallellightrays.jpg (a) Determine where the light rays come to a focus relative to the...

I was focusing sunlight on my Magnifying Glass & was amazed how powerful the beam was. Even on a dark object it was far too bright to look at. I wanted to try & cook & marshmallow with it. But would that be dangerous because of uv rays? Is it just visible light that focuses through the glass or...

Homework Statement I have done the light ray through a glass block experiment at different angles. I've taken the measurement for i1 which is from the incident ray. and i2 which is from the emergent ray. Then I have to take the average of i1 and i2 and then plot a graph using the average...

Why does glass not permit long wavelength infrared to pass through?

Homework Statement Onto a thick brass rod we attach equally long glass thread. At what temperature change will the glass thread break if the temperature coefficient of linear expansion for brass is α1= 20 x 10 ^-6 K^-1, and for glass is α2= 7 x 10^-6 K^-1? Young’s (elastic) modulus for...

http://home.cc.umanitoba.ca/~loly/102-dec_word.pdf The above is a link to the problem - Question #3. Homework Statement A glass tube has several different cross-sectional areas with the values indicated in the figure. A piston at the left end of the tube exerts pressure so that the mercury...

Hi, I want to know how light travels through glass. As per my understanding of physics, a photon is absorbed by an electron and the electron goes to a high energy orbit and returns to its original state after a moment and emits another photon. This is how light travels in glass. But how...

"What pressure do you need to get water to flow at 2 m/sec coming out of a hole?" Here is the visual of a container sitting on top of a glass of water with a hole poked through the bottom: http://i96.photobucket.com/albums/l168/synovial/fluids.jpg Given: A1, A2, V2, (y1-y2) Find: patm...

Homework Statement An ordinary drinking glass is filled to the brim with water (266.3 mL) at 3°C and placed on the sunny pool deck for a swimmer to enjoy. If the temperature of the water rises to 32°C before the swimmer reaches for the glass, how much water will have spilled over the top of...

Homework Statement The water level in a vertical glass tube (length 1 m) can be adjusted to any position in the tube. A tunning fork vibrating at 660 Hz is held just over the open end of the tube. calculate at what position of the water level will there be resonance (standing waves) in the...

Homework Statement A piece of curved glass has a radius of r=10m and is used to form Newton's Rings. Not counting the dark spot in the center of the pattern, there are one hundred dark fringes the last one on the outer edge of the curved piece of glass. The light being used has a wavelength...

Homework Statement A simple glass lens do not focus the image of an object correctly under white light because a. the lens absorbs light b. the glass has come colouration due to impurities c. the surface of the lens reflect some light d. a glass prism splits sunlight into different...

I've been thinking about this question for a little while now and figured maybe a good answer here would help to resolve it. Can glass ever break diamond? Some people I know say it's impossible and yet I am left thinking that it is just a matter of how much power is generated by the impact of...

Hey all, I went to my 10 year HS reunion party last night, and took about 125 photos using my Sony Alpha 350DSLR, a kit lens, and a Promaster hot-shoe flash. The camera was set to manual exposure of 1/10th sec to allow the ambient light to fill in the background, while the flash was left on...

Is it possible to make one of these at home using an everyday glass bottle? If so could anyone tell me how? Thanks

Hello all, doing some reasoning and subsequent Gadenkin experiments, followed by a Non-scientific experiment results in some interesting changes in magnetic fields using glass lenses. Here it is, and please help me to explain this phenomenon, as I can find no mention of it anywhere. Two bar...

What causes water and other similar transparent things to become transparent? Visible light can pass through transparent solid object like glass but can't pass through many opaque objects. What is the reason? Again when liquid water turns into ice it loses its transparency. I'll be very...

When it comes to washing glasses, there is always a little residue left over. Presume for a 100mL glass about 0.50mL is left behind when you pour out the contents. Which will do a better job of rinsing out the glass after the first pour? Rinsing 1 time with 1.000L of water (in a large out...

Hi, I'm doing an investigation into the absorbance of UV light by glass of varying thickness (constant density and standard type of glass) for an assigment. However, we're not actually supposed to carry out the investigation due to time constraints, so we're meant to make up the numbers...

hello my question is why glass is transparent why the photon are traveling in it without being absorb use equation & explanation , please this Q? for high level Physicist not for anyone so pleas if you can't use proper equations DONT REPLY and why its path are so specific and strait ?

Homework Statement A beam of light is split into two coherent beams of intensity I which are in phase. The two beams are sent through different paths and superimposed at the same spot on a screen. A path difference is to be achieved by inserting a glass window of refractive index of 1.7 in the...

If slaughterhouses had glass walls, everyone would be a vegetarian. -Paul McCartney would you become one?

I am a little confused by movement. It is difficult to explain, but here goes. Say I have a needle which is almost touching a pane of glass, so close if fact that the smallest movement toward the pane would result in the needle touching it. My confusion is, if the needle has to move to touch the...

Two glass bulbs of equal volume are joined by a narrow tube and are filled with gas at s.t.p. (standard temperature and pressure where \theta = {0^ \circ }{\rm{C}} and p = 1.01 \times {10^5} Pa). When one bulb is kept in melting ice and the other is placed in hot bath, the new pressure is 1.166...

Homework Statement If a glass rod of diameter 1cm is loaded with a 1kN tensile load and has a young's modulus of 70 GPa, what is the tensile strain? Homework Equations The Attempt at a Solution Im sure if somebody could tell me the formula for this i could work it out easily

Hi all, can a laser light be magnified by means of a magnifying glass?

Hello, Having a spot of bother here trying to understand the glass formation in metallic glasses. Could anyone please explain or point me to a source that explains in details structure and kinetics in glass formation? Thanks

Homework Statement The near point of a naked eye is 33 cm. When an object is placed at the near point and viewed by the naked eye, it has an angular size of 0.060 rad. A magnifying glass has a focal length of 16 cm, and is held next to the eye. The enlarged image that is seen is located 51...

Hi, this is not a homework question. Been out of school for way to long and can't remember my physics. I am developing something and I need an equation. What is the angle at which liquid will pour out of a glass? The input I think would only be the % full the glass is. I do not think the...