why glass traps IR waves?(principle of green House)?
157021
glass is transparant to the visible spectrum, but absorbs many other wavelengths of EM radiation.
710202
You are right! Atomic structure has everything to do with what wavelengths are absorbed, and which ones are reflected. I works with light, and it works with radio waves... Thats how they make stealth aircraft. Funny thing about copper... when powdered and burned, it makes a pretty green color!
550519
It is about the frequency, not the amplitude. Any frequency below 20 000 Hertz is capable of shattering glass provided it's constant and from an uniform source and is properly directed onto a subject, which is glass in this case.
1030581
Over the years, some of the gases like carbon dioxide have accumulated more than they should in the earth's atmosphere.. these gases are called green house gases and cause a effect known as green house effect....\nWhen radiation from sun rebound from earth surface some of them are absorbed and rest escapes to space.... but these greenhouse gases absorb more than what is good for earth.. and have slowly raised the temperature.....\nThis effect is called global warming and is causing eccessive melting of snow in antartica.
12257
DB: This is Earth and Sky. A listener wants to know, "Can people actually shatter glass by singing a particular note?"\n\nJB: To understand the answer to this, you need to know that every object has a resonant frequency -- that's the natural frequency at which an object vibrates. If you could run a damp finger along the rim of a glass, you might hear a faint, ghostly hum -- the resonant frequency of the glass. To shatter the glass, the singer's voice has to be able to match that frequency.\n\nDB: Also, the singer has to sing very loudly. A jackhammer operates at a loudness of about 90 decibels. The human threshold for pain comes at about 120 decibels. To shatter a glass, a singer has to produce a note with an ear-splitting intensity of about 135 decibels.\n\nJB: And the singer also needs to hold that note for at least two to three seconds -- for the vibration to build up enough to cause the glass to shatter. It helps to have the right kind of glass, too -- a large one -- with thin, nearly vertical sides. In the late '70s, laboratory experiments with a professional soprano and a trumpet player showed that neither could shatter glass. The famed tenor, Enrico Caruso, was said to be able to do it -- but his wife denied it. \n\nDB: So there are physical conditions under which a human voice should be able to break a glass. But it's improbable that an unamplified human voice could actually do it. With thanks to the National Science Foundation, we're Block and Byrd for Earth and Sky.\nAuthor(s): Marc Airhart
371665
Well.. you say white light it's not refracted by glass... Then if that's true, there shouldn't be a rainbow EVER, no?\nThat's the point, white light it's composed by several colors, that's why it's white. When it goes through a glass, it WILL be refracted, causing it to separate into different spectres of light. Of course, only a minimal part of it will be refracted, for those glasses are constructed in such a way to prevent it from doing so.
745654
The glass is very thin and the bulb is very hot. The sudden change in temperature causes the galss to shatter because glass is not flexible and cannot change that fast. Remember, heat causes expansion and cold causes shrinkage and by doing this, you have caused a small area of shrinkage on the surface of the bulb.
1127994
It really depends on the motion sensor. There are two types, active and passive. Active sensors include the sensors that open grocery store doors (these send out microwave radio energy then wait for it to bounce back), also alarms that emit beams of light (if the beam is broken the change in light is detected). Active sensors basically send something out into the environment and receive the changes. The motion sensor in most alarm systems are considered passive dectectors because they don't emit anything, but detect changes in energy such as infrared energy. These are usually set to detect small changes in the temperature of the human body. One cool experiment is if you stand behind a window, the motion sensors won't "see" you! This is because glass isn't a good conductor of infrared energy. Either way, these devices are interesting inventions!
352065
some is reflected by the glass, and some passes straight through.  A tiny part will go towards heating up the glass itself, as it is absorbed during its transition throught the glass.
959091
Because the curvature of the glass will falsify your measurement (light diffraction, bending of a flexible measuring tape). You have to measure edge to edge on the concave side to avoid this.
1089471
What you want is an IR blocking filter. An optical supply house like Melles Griot , Reynard, or Edmund can supply you with one.  Depending on the intensity of the radiation, you may be better off using a cold mirror or hot mirror. These are dichroic mirrors that pass infrared and reflect visible light, or vice versa. They can be used where a blocking filter might get too hot from the radiation absorbed. \n\nSchott glasses KG1 through KG5 are some available IR blocking filters.
46903
Although a lens can intensify sunlight (and even start a fire), what window glass normally does is act like a filter. It admits visible light, which is then reradiated as a mixture of visible and infrared light. The infrared light is blocked by the glass and trapped inside the building or car, warming it. \n\nThis is of course the well-known greenhouse effect. That is why cars can get so hot in the sun that they can be lethal to babies and pets inside. That is why the earth is habitable, because greenhouse gases in the atmosphere act like glass and keep the earth warmer than it would otherwise be. The greenhouse effect is what allows the cultivation of fruits in colder climates (another name for greenhouse is hothouse).
298607
I do not know how deep you want to go. This could get quite complicated. \n\nThe simple answer is that it absorbs infrared radiation. That is, it is opague to IR light (heat). \n\n\nHere is how it does it:\n\nLight at all wavelengths falls on the atmosphere. Some gets transmitted to the ground. The surface absorbs this radiation, and some of it gets reradiated as heat, or IR light. The carbon dioxide in the air will not let it escape out into space.\n\nOf course, one can make this far more sophisticated and detailed.\n\n- - - - - - - -  - - - - \n\nObviously this is a multiple-choice homework problem. I am afraid if you cannot figure out which answer to choose from my response, then you have some problems. You need to ask the teacher for help. I will not spoon-feed you.
994451
Ive never really heard about infrared causing any health problems, but at the same time, it is radiation coming from those little things (miniscule if im not mistaken). I think you'll be ok as long as your not like, pointing the remote control at your eye and pressing the button day or night.
364281
You are obviously sensitive to the vibrations of that energy field, it vibrates at a higher rate than our own,just like we can't see in the infrared light range naturally,without special equipment,well we don't see the spirit world, unless we are more sensitive to the wave length of that energy, it is just more developed in you.
844853
Glass generally has not much effect on the radio frequencies.  It is the other material like metal that reduces the range.  It will not strengthen the signal by any means though.\n\nIt is not harmful.
163519
The electrical contact for the bulb is on the very tip of the screw, and water is kept from reaching it by the screws themselves.  You can tell when you screw it in that it's a tight fit.  Additionally, the glass is sealed to the metal, so that moisture and particulates can't get inside to the filament.