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Which of the noble gases is most often used in neon signs?

Neon is a highly inert gas, making it easy to use. Its distinctive red glow is also eye-catching, making it ideal for signs and lighting. Tubes of plastic or glass are filled with neon, and as electricity passes through, the discharge excites the neon ions and pushes them into a higher energy state. The energy expended by the ions as they move shows up as a bright red color. The tubes can be twisted depending on design.\nAside from lights made from pure neon, other colors can be created when combined with other noble gases and elements. For instance, neon mixed with mercury creates a light blu..

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What is the principle behind the analog single phase wattmeter?

Analog wattmeters are similar to early electrodynamometers because they have a pair of fixed coils called current coils. They also include a movable coil. This movable, or potential, coil is connected in parallel with the circuit, and carries a needle that indicates current measurement as it moves over a scale. The two current coils are connected in series to the circuit, but can also be connected in parallel to each other to change the range of the wattmeter. Analog wattmeters measure true power when connected to an AC circuit.

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What is the function of the phalanges?

Phalanges, known as phalanx in singular form, are long bones that exist in every finger and toe. In total, the human body contains 56 phalanges bones, each of which has a joint or knuckle to connect it with others. The proximal bones sit just below the knuckle with the intermediate bones above the knuckle. The distal phalanges are the fingertips. Distal extremities are proximal extremities.

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What is a flower ovule?

Where the ovules are located varies on the type of flower. In flowering plants or angiosperms, the ovary protects and encloses the ovule. With conifers and other gymnosperms, the ovules are uncovered on the outside of the cone. The location of the ovules determine plant classification. Campylotropous ovules are 90-degree angles to the funiculus. Anatropous ovules are near the funiculus, and orthotropous ovules stand straight in the cavity of the ovary. The funiculus is a short stalk or fruit wall, much like a placenta.\nWhen a flower is fertilized, pollen lands on the stigma. A tube grows down..

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Is digestion a chemical or physical change?

Food is chemically digested by enzymes. Once food has been broken down, the nutrients are sent into the bloodstream where they find their way into the liver. The liver processes these nutrients and what is left works its way into the large intestine. There, it undergoes more of a chemical change as it is subjected to bacterial fermentation. It is in the large intestine that waste is produced and prepared for elimination from the body. Food provides the body with essential macronutrients that are extracted from it by the various chemical processes used during digestion.

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What is a bright line spectrum?

When white light from the sun passes through a prism, it creates the full rainbow of colors. However, the University of Colorado indicates that the heated gases give off light in specific wavelengths that are responsible for the bright line spectra. Each material gives off a spectrum so unique in nature, it allows the scientist to identify the gas he is heating through the science of spectroscopy. In addition to the lines in the visible spectrum, the gases also create lines that are invisible to the human eye but detectable using other devices.\nAbout.com says that as electrons change from one..

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What are the general characteristics of epithelial tissue?

Because they are so closely packed, epithelial cells have little matrix between them. They're separated from underlying cells by a basement membrane.\nEpithelial tissue is responsible for protecting the body, secretion and excretion, absorption and allowing the organism to sense the outside world. There are three basic types of epithelial cells: squamous, cuboidal and columnar. Epithelial cells can come in sheets of one or more layers. The squamous cells are thin and look like scales with irregular edges. They make up the cells that cover the surface of the body as well as lining the mout..

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What does the circulatory system do?

The pulmonary circulatory system is the smaller of the two, as it only runs from the heart to the lungs and back. It's main function is to absorb oxygen from the lungs into the bloodstream, after which the oxygenated blood is pumped back to the heart. After entering the heart, the oxygenated blood is then sent throughout the rest of the body by systemic circulation.\nThe heart is split into four chambers: the left atrium, left ventricle, right atrium and right ventricle. The oxygen-depleted blood that leaves the heart on its way to the lungs does so through the pulmonary artery, which is ..

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What is the structure of elastin?

Elastin is a major protein component found in all vertebrates in categories above jawless fish. It is composed of a number of simple amino acids like glycine, valine, alanine and proline, known as tropoelastin protein. Elastin is found in various organs that require elasticity:SkinArteriesLungsCartilage and ligamentsBladderLarger arteries like the aorta contain high concentrations of elastin. The structure of the elastin protein makes it particularly important in the function of tissues that stretch and contract as well as in load-bearing body components.

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How many kW of electricity can a 3kW solar panel make in a year?

Solar panels have been used as an alternative source of energy for over 40 years, and solar cell technology has improved significantly over the years. With this, the cost of installing solar panels has plummeted, with some states in the United States even offering incentives to households that use them.\nGlobally, Germany leads in terms of solar energy utilization, having 17 times more solar panel installations than the United States. However, federal and state incentives have led to a 69 percent increase in solar panel installations in the United States since 2011.

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