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submitted by Anisha (0 m) on 16 Jul 2012 16:01:59 IST
Everything You Need To Know About Radioactivity And Alpha RadiationBy Emma LIf you have ever wondered what is Radioactivity and could not find the answer then you have come to the right place. Radioactivity is a very interesting phenomenon that occurs in nature as well as in labs where it is done artificially. In this phenomenon, the nucleus of atoms disintegrates by emitting waves of energy called radiation.The atoms of heavier elements do not have an ideal proton to neutron ratio. This makes them unstable. In order to approach the stable ratio, the atoms go through radioactive decay and in process emit energy or various particles as by products. The most common ty   ...

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submitted by Bharati (70 m) on 16 Jul 2012 15:59:51 IST
ComponentsThe three major elements that make up an X-ray machine are the vacuum tube, the high-voltage power source and the operating console. The X-ray tube is essential to the machine and getting the correct results as it is the piece that ultimately produces X-rays. The high-voltage power supply uses a transformer to accurately alternate between the voltage of currents being sent to the emitter or to the anode. The emitter requires a small voltage supply to produce small currents, while the anode needs a large voltage supply to keep the speed of the electrons up. The energy of radiation that is produced is dependent on the high speed of the electrons. The operati   ...

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submitted by Bharati (70 m) on 16 Jul 2012 15:51:32 IST
Heat transfer occupies a field which comprises a wide range of functions, from the simple processes of objects heating and cooling to advanced thermodynamic concepts in thermal physics. In order to understand how a drink cools in the summer or how heat travels from the sun to the earth, you must grasp these basic principles of heat transfer on a fundamental level.SignificanceThe Second Law of Thermodynamics states that heat transfers from an object of a higher temperature to that of a lower temperature. The higher energy atoms (and thus higher temperature) move toward the lower energy atoms (lower temperature) in order to maintain equilibrium (known as thermal equil   ...

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submitted by Vaibhav (0 m) on 16 Jul 2012 15:48:08 IST
Understanding the Isothermal ProcessBy Umesh Kumar MIf you are interested to pursue a career in the field of Physics then it is better that you start early. You must take physics and other science subjects in your high school and consider a physics degree from a good institute. However, classroom instruction is always not enough to clarify your doubts and give you a clear understanding of the various concepts. When you are introduced to the first basic course in thermodynamics, you will be introduced to several processes that you will hear for the first time. One such important process is the isothermal process, and in this article, we will discuss about it in detai   ...

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submitted by Sumit (0 m) on 16 Jul 2012 15:42:03 IST
Heat TransferAuthor: Elizabeth WilsonAs we know that heat is a form of energy, and heat transfer takes place between any two systems due to temperature difference.Energy transfer occurs from a system of higher temperature to a system of lower temperature according to the second law of thermodynamics without any work transfer. But heat transfer can take place from a system of lower temperature to a system of higher temperature by adding external work. The subject dealing with the rate of heat transfer is called the "heat transfer".The subject of heat transfer is applied in the design of boilers, heat engines, refrigerators, cold storages, air conditioners e   ...

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submitted by anu (0 m) on 16 Jul 2012 15:38:33 IST
What is Thermodynamics?By Pauline GoThermodynamics is one of the branches of physics. It deals with the study of the transformation of mechanical work into heat and the opposite transformation of heat into mechanical work. There are some more things which are great concern in this study, i.e. the temperature, volume and pressure. Thermodynamics is used in many fields of science and engineering. It is used in making engines, chemical experiments, cell biology and many other things.Taking an example of a Thermometer. A thermometer is a device which is used for measuring the temperature of human body. It is system of thermodynamics. The person has to put the thermomete   ...

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submitted by Sanjay (0 m) on 16 Jul 2012 15:26:08 IST
What Are Laser Optics?By Max JasperLasers are made with light emissions that are generated by electromagnetic radiation. The light waves are amplified and can be also described as excited photons. The light emissions are stimulated to a higher magnitude or amplification which can also be described in the wave physics as the high degree of coherence or constructive interference with respect to spatial and temporal addition. This type of radiation is known by the term laser because of what the letters of this word stand for, which is Light Amplification Stimulated Emission Radiation.How does one make a laser beam? First a light energy source with gain medium must be c   ...

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submitted by Bharati (70 m) on 16 Jul 2012 15:25:16 IST
The wave properties of light, the way light travels, mean that light can experience interference from other types of waves. This phenomenon is called optical interference.The color of a wave determines the type of interference and the effect on the interfered wave.HistoryWhen scientists in the 17th century began to experiment with the nature of light, their first observations of light's properties came from watching light passing through a slit. The phenomenon,coined as "diffraction," means that the light broke up. Other experiments dealt with the phenomenon of colors and the nature of white light. Sir Isaac Newton performed experiments in the latter c   ...

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submitted by Ramesh (0 m) on 16 Jul 2012 15:13:52 IST
Optics began with the development of lenses by the ancient Egyptians and Mesopotamians, followed by theories on light and vision developed by ancient Greek and Indian philosophers, and the development of geometrical optics in the Greco-Roman world. The word optics is derived from the Greek term τα ?πτικ? which refers to matters of vision.[1] Optics was significantly reformed by the developments in the medieval Islamic world, such as the beginnings of physical and physiological optics, and then significantly advanced in early modern Europe, where diffractive optics began. These earlier studies on optics are now known as "classical opt   ...

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submitted by Vaibhav (0 m) on 16 Jul 2012 15:04:37 IST
LightEverything seen must get carried to the eye through light. The eye functions to take light and send it to the brain, which translates the light into images. Light does not enter the eye from one angle but many. These all enter into the eye past the cornea, which focuses the beams through the dark pupil at the center.FocusingPast the pupil, light moves through the lens. This lens pulls the light and bends it so that it hits the back wall of the eye called the retina. Without the focusing of light from the lens, vision loses its sharpness. Some people cannot see clearly because they get a film over the lenses of their eyes known as a cataract.Holding the lens in   ...

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submitted by Anisha (0 m) on 16 Jul 2012 15:01:25 IST
The World of Fiber OpticsBy James CroydonPrinciple of fiber optics is based on transmission of data by means of light. Concept of fiber optics was first conceived by Claude Chappe in 1790's. His idea for fiber optics was based on an optical telegraph concept invented by Graham Bell also tried the means to send information by the atmosphere but did not succeed. Finally, fiber optics emerged with the onset of new era based on the principle of total internal reflection which is a distinct quality of light rays.Fiber optics emerged and grew into more advanced phase due to requirement from radio and telephone engineers. These engineers required more bandwidth for dat   ...

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submitted by Sanjay (0 m) on 16 Jul 2012 14:37:55 IST
Problem Solutions in Fluid Mechanics IBy William MoebsThe fluid mechanics taught in introductory physics is an ideal topic for demonstrating how to teach in terms of basic ideas. There are four important principles taught in introductory fluid mechanics. They are: (i) pressure variation with height; (ii) Archimedes' principle; (iii) equation of continuity; and (iv) Bernoulli's equation. These four can be combined with mechanics principles such as Newton's second law and the conditions for static equilibrium in a wide range of interesting problems. I will cover my problem-solving approach for fluids in three separate articles. As usual, I describe the met   ...

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submitted by Bharati (70 m) on 16 Jul 2012 14:33:01 IST
Sound waves and their different featuresAuthor: jonryswrooloud waves are a shape of mechanical longitudinal pulses, condensations, which breed in a medium.When we talk, we hear the tones are sound waves that breed spherically, in all directions, in the surrounding air. The air acts as an flexible medium in which force variations, ie. tones, stretches in. Sound waves consist of longitudinal waves and propagates by compressing the matter. Example: if you were talking so creates a startle wave in atmosphere travel and reach the interlocutor's eardrum, which vibrates and transmits pulses to the brains (simplified form).A essential representing a sound swell to breed   ...

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submitted by Rehan Verma (15 m) on 15 Jul 2012 16:10:09 IST
  One day your life will flash before your eyes,make sure it's worth watching.Everyone tries to impressthat special someone, butif you can't get them byjust being yourself they can'tbe all that special.If you don't like someone, theway he hold his spoon will makeyou furious. If you care about someone, he can turn his plateover in your lap and you won't mind.You can close your eyesto things you don't want to see.But you can't close your heartto things you don't want to feel.It turns out sometimes youhave to do the wrong thing.Sometimes you have to make a big mistaketo figure out how to make things right.Mistakes are painful b   ...

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submitted by Sanjay (0 m) on 16 Jul 2012 14:06:44 IST
A Guide To CarbohydratesAuthor: James HartA Guide To CarbohydratesCarbohydrates have got somewhat of a bad reputation recently with many ‘diet gurus’ writing about how they can make you ‘fat’ or prevent fat loss, so with the abundance of (what I think to be) misinformation about carbohydrates I thought I would outline what carbohydrate are, how they work, and why they are important!EnergyCarbohydrates are the body’s preferred energy source, what this means is that the energy your body needs to keep itself active comes from the carbohydrates that you consume. Most of the carbohydrates you eat are stored in the form of muscle or liver gly   ...

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submitted by Sumit (0 m) on 16 Jul 2012 13:37:39 IST
The study of physical and chemical behavior of metallic elements, their inter-metallic compounds and alloys is known as metallurgy. It is a domain of material science. In short metallurgy can be defined as the technology of metals. The procedures involved in extracting metals from ground and the procedure in refining, alloying and making things out of metal is also discussed in this domain of material science. An engineer or a person who is specialized in metallurgy is known as metallurgist. They have specialized knowledge in geology as extracting metals is related with study of soil. Historical developments in metallurgy were found in a wide variety of past civiliz   ...

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submitted by Bharati (70 m) on 16 Jul 2012 13:35:05 IST
1. The scientific community has two accepted definitions for transition metals: first, it is an element with incomplete d sub-shell atoms, which may or may not result to cations with incomplete d sub-shells. The second defines about it as the elements found in the dblock of the periodic table.2. Charles Bury first used the word "transition" to describe the elements that undergo a transition series during an electron's change of inner layers. This transition occurs from a stable group of 8 to a group of 18, or from 18 to 32. These elements that underwent transition are now referred to as transition metals or d-block elements.3. The atoms of the d-block   ...

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submitted by anu (0 m) on 16 Jul 2012 13:24:32 IST
IntroductionHydrogen is the first element in the periodic table. It is the chief constituent of stars.99% of stars is composed of Hydrogen and 1% Helium (formed by nuclear fusion of hydrogen) about which you will learn later. Water which is also known as "life" is also a compound of hydrogen.What is Hydrogen?It is an element with 1 electron and one proton. Normally it does not contain neutron. But "Heavy Hydrogen", which is radioactive in nature contains neutron. The atomic no. of hydrogen is 1 and mass no. is also 1. It occurs as a diatomic gas at S.T.P.Chemical PropertiesIts electronic configuration is 1S1 i.e. it is one electron short of the n   ...

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submitted by Ramesh (0 m) on 16 Jul 2012 13:20:25 IST
The first two and last six columns in the periodic table, called the S-block and P-block, reflect the structure of the corresponding s and p shells of the elements in these blocks. Columns in the periodic table form families of elements having similar chemical properties. S-block elements are made up of metals; the P-block constitutes a variety of elements, including noble gases, halogens and metalloids.S and P ShellsThe electrons that orbit atoms form distinct structures called shells. Each shell contains orbitals, which the electrons occupy according to principles of quantum mechanics. The S-shells have a spherical shape, and multiple S-shells form concentric, oni   ...

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submitted by Sanjay (0 m) on 16 Jul 2012 13:02:54 IST
The Four Different Types of Metals and Their Contribution to MetallurgyBy Maria Veronica BuenaventuraThe earth is indeed an amazing and perfect place to live. It has the things that are necessary for us to survive. It provides with the enough resources for our needs. There is no place like earth. Humans are the highest level of organism living on this planet. We are even termed as the stewards of this place. Although plants and animals are also considered as living organisms, humans are given the chance and the will to utilize the natural resources that can be found on earth.These natural resources include plants, wood and minerals. Metal is one of the oldest minera   ...

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