Glass Definition and 658 Threads

I am currently building a solar panel. I have sheets of glass that I collected, some is saftey glass and some are tempered (probably the same). I have read that Low Iron Tempered glass has 91% light transmission. How do I test the glass that I have for its light transmission? Thanks

itxx change lykk why water in glass flask first decrease then increase?replyy

So if i have a marble in a glass tube and i rotate the tube around in a circle . and the marble is at a distance r from the center of rotation . is the reason the marble goes towards the outside of the tube because when the glass tube starts to rotate the marble wants to go tangent to the...

Homework Statement the prism is made from glass, and its cross section is an equilateral triangle. the indices of refraction for the red and violet light are 1.662 and 1.698, respectively. the angle of incidence for both the red and violet light is 60 degrees. find the angles of refraction at...

regards, i m doing my MSc in glass ceramic, i ve read in journals saying that when glass are heated above its crystallization temperature, it can be considered to transformed into glass ceramics, and of course if has to undergo XRD or FTIR or FESEM to confirm it, but how can we say that it is...

I need help to understand what is happening when I project a image in a sheet of glass. Imagine this picture, a projector as the light source projecting a image in a sheet of glass: 1: I have high transmission. (the light that pass away the sheet of glass) 2: Low absortion 3: A so so...

Homework Statement A Glass of water is freely sliding down an inclined plane. The water surface has settled down after some initial disturbances. Which of the three cases is possible for the shape of the water surface: 1) It will remain parallel to the incline 2) The water surface will rise...

Lower frequency should have an easier time getting through glass than that of visible light. However remote controls for electronic devices to not work when glass is in the way. Then you go down even further into the spectrum to my wireless router and it has no problem going through glass...

Hello folks! I have a few questions regarding plastics. I am pretty new to material science, so please bear with me... I am actually looking for a material with a set of specific properties that my design requires: good impact resistance, moderate to high thermal resistance / high melting...

Homework Statement A glass vase has the shape of the solid obtained by rotating about the y–axis the area in the first quadrant lying over the x–interval [0,a] and under the graph of y = \sqrt{x} Determine how much glass is contained in the vase. Homework Equations y = \sqrt{x}...

Hi all, can someone kindly advice on how to model a femtosecond laser beam profile when it is focus on/into a transparent material. Regards Jim

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...

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?

I have been given a statement and have to decide if it is true or false and then justify my answer. I have already established that this statement is false by the fact that a magnifying glass creates a 'virtual image' not a 'real' one but i am having trouble working out what else is false...

focal point of image in magnifying glass -------------------------------------------------------------------------------- I have been given a statement and have to decide if it is true or false and then justify my answer. I have already established that this statement is false by the fact...

I have been given a statement and have to decide if it is true or false and then justify my answer. I have already established that this statement is false by the fact that a magnifying glass creates a 'virtual image' not a 'real' one but i am having trouble working out what else is false...

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?

1. i have this science fair project coming up, and we had an idea to use acoustic levitation here is a link (http://www.thenakedscientists.com/HTML/content/kitchenscience/exp/acoustic-levitation/") the problem is that i don't know what the resonance of air is in a wine glass. it says that i need...

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 glass...

Homework Statement hamiltonian is given by H=-\sum Jij si sj so interaction constants are Jij=EiEj and Ei=+1,-1 si=+1,-1 randomly , they are spin variables. the question is : show that this system is equivalent to a ferromagnet, by redefining the spin variables. The Attempt at a Solution...

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...