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Spectroscopy
Spectroscopy is a branch of analysis devoted to identifying elements and compounds through the measurement of the absorption, scattering, or emission of electromagnetic radiation by atoms or molecules. It is widely used in physical and analytical chemistry, as well as in astronomy and remote sensing. Questions and answers here have to do with anything that has to do with Spectroscopy.
513 Questions
How raindrops and prisms produce colors from white light?
This website is awesome at explaining what is a rainbow and how it forms etc...
http://www.myuniversalfacts.com/2006/04/how-rainbows-are-formed-what-causes.html
The sun's light has wavelengths of many different colors, and when it rains there are many raindrops on the ground and the light refracts the light into a continuous band of colors. Check out that website for more detailed information about "white light" such as the sun's light and how it has wave lengths of colors...
When light waves enter a new medium and bend what occurs?
When light enters a different medium, the amount that the light is bent as it enters the medium is determined by the medium's index of refraction.
What are the uses of ultraviolet waves?
Medicine:
Ultraviolet waves are effective in killing bacteria and viruses. Hospitals use germicidal lamps that produce these waves to sterilize equipment, water and air in operating rooms. It is also used to treat acne and psoriasis.
Industry:
The Food and Drug industry uses germicidal lamps to disinfect various types of products and their containers. The main use of ultraviolet is in the manufacturing integrated circuits.
Science:
Scientists learn about the make up and energy levels of atoms by studying UV rays. Experts also learn abut distant stars and galaxies by analyzing the UV rays that are given off. Artificial sources of ultraviolet light are often used to stimulate the effects of solar ultraviolet radiation in the study of the deterioration of materials on exposure to sunlight
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Consumer Goods:
Ultraviolet waves are used to identify materials by the glow or fluorescence under them. They are used to make black lights. May food and drug companies use germicidal lamps to disinfect various types of products, and their containers.
How do you determine the attractive electrical force between an electron and proton?
You can determine the attractive electrical force between an electron and proton using Coulomb's law. The force is directly proportional to the product of their charges, and inversely proportional to the square of the distance between them. The equation is F = k * |q1 * q2| / r^2, where F is the force, k is Coulomb's constant, q1 and q2 are the charges of the electron and proton, and r is the distance between them.
What does an spectroscopy measure?
It measures the relative amounts of light of different wavelengths absorbed and transmitted by a pigment solution.
How angle of incidence affect refractive index of a material?
The angle of refraction is the angle between the refracted ray and the normal (a perpindicular line to the tangent and the plane of the surface). A ray that enters at the normal angle leaves at the normal angle; there is no angle between the ray and the normal, so it is 0o.
Who invented the electromagnetic spectrum?
You don't invent scientific facts - they are there for anybody to observe. You discover them. I believe Maxwell's calculations were groundbreaking in this sense; he calculated that an electromagnetic wave would move at the speed of light, and concluded that light was probably an electromagnetic wave, too. This was later confirmed. However, parts of the electromagnetic spectrum were later discovered by other scientists, for example, Röntgen.
What is a non-conductive material such as glass or porcelain called?
Bamboo flooring is becoming quite popular in some areas but it is not as easily available yet. You could check with local flooring companies to see if they have any.
What is spectroscopy applications?
You can find the structure of protein using CD spectroscopy. you can measure the concentration of biomolecules using UV-Vis spectrophotometer.If you have a specific problem, I may suggest which spectroscopy is suitable for you
How do you calculate the number of protons from NMR spectrum?
Answering "http://wiki.answers.com/Q/How_do_you_calculated_the_percentage_of_an_isomer_using_proton_nmr"
What colors are in a light prism?
A prism refracts light into its component colours just like a rainbow does, so some of the colours are....
* Red * Orange * Yellow * Green * Blue * Indigo * Voilet
.... and there are lots of intermediary colours in there also.
What is the traditional method of infrared spectroscopy?
Infrared spectroscopy (IR spectroscopy) is the subset of spectroscopy that deals with the infrared region of the electromagnetic spectrum. It covers a range of techniques, with the most common type by far being a form of absorption spectroscopy. As with all spectroscopic techniques, it can be used to identify a compound and to investigate the composition of a sample.
For further details, see the links to the left of this answer.
What is the basic principles of uv-visible spectroscopy?
Spectrophotometry is an important branch of spectroscopy that focuses on the technique of measurement. In this technique, the amount of light that a sample absorbs at a particular wavelength is measured and used to determine the concentration of the sample by comparison with appropriate standards or reference data. The most useful measure of light absorption is the absorbance (A), also commonly called the optical density (OD). The absorbance is defined as A = log I0 / I where I0 is the intensity of light that is incident on the sample and Iis the intensity of light that is transmitted by the sample. The absorbance of a sample can be related to the concentration of the absorbing species through Beer's law: A = ε cl where c is concentration, usually measured in moles per liter; l is the length of the light path, usually 1 cm; and ε is a proportionality constant known as the molar extinction coefficient, with the units of liters per mole per centimeter. The value of ε is a function of both the particular compound being measured and the wavelength.
What is the difference between flame photometer and atomic absorption spectrometer?
A spectrometer is a general term for an optical instrument. Spectrometric methods convey a large group of analytical methods based on molecular or atomic spectroscopy. Spectroscopic instruments will typically contain a stable source of radiant energy, a transparent veil for the sample or blank, a component to separate different wavelengths of light, a detector, and a readout/processor.
Photometers are simpler in design compared to spectrophotometers. They are less expensive, more convenient, easier to maintain, and good for field work. Some photometers include: visible photometers, probe-type photometers, and general purpose photometers using adjustable filters.
Spectrophotometers may have a few more mirrors, slits, a grating, and maybe a filter to top if off. Some examples include the popular Spectronic 20, Varian Cary 100, or even miniature fiber-optic spectrometers.
What do the white areas in the interference pattern represent?
The white areas in an interference pattern represent constructive interference, where waves from two sources meet in phase to produce a brighter intensity. This occurs when the crests and troughs of waves align, reinforcing each other to create a brighter spot of light.
107.5 approximately, as the molecule is based on a tetrahedral shape, which should have 109.5 degree bonds, but the lone pair on the N causes the bond angles to be slightly decreased, by about 2 degrees
How do you get a good FT-IR baseline?
To get a good FT-IR baseline, ensure that the instrument is properly calibrated, the sample chamber is clean, and measurement conditions are consistent. Use a blank solvent or reference material to correct for any background noise, and average multiple scans to improve signal-to-noise ratio.
What is a similarity in the line spectrum of mercury and the spectrum of the fluorescent bulb?
A fluorescent lamp contain mercury so the identities of spectrum are normal.
Well, they aren't always black. Heatsinks that depend mostly on convection or forced air to dispose of waste heat can be any color.
However a heatsink that depends in large part on radiation to dispose of waste heat should be black. This is because the ideal emitter/absorber of radiation is a blackbody. A blackbody emits an ideal continuous spectrum of electromagnetic radiation with a peak at the high end of the band and no missing frequencies in that band. If the color is not black there are missing frequencies and the radiation is not the most efficient it could be.
What is coherent radiation in spectrometric methods?
There are two types of coherence time and space coherence. Time coherence means that the wave phase stays constant in time. Space coherence is when the wave phase is a constant when light travels in space. Both are really important and can be found in lasers and other sources of electromagnetic radiation.
How does blue light penetrate water?
All light penetrates water to a certain extent. However, the shorter the wavelength of the light, the more energy it carries and the less it is absorbed by the water. Blue has a short wavelength compared to red light, so it penetrates further than most of the rest of the visible spectrum.
