... wave it has a frequency calculated by the equation: = c/f where f is the frequency c is the speed of light which is equal to 3.00 x 108 m/s and is the wave length of light. Also waves have crests, the high points of waves, and troughs, the low points. Constructive interference occurs when two waves of the same frequency meet at a crest or trough therefore combining to form a wave that has an amplitude equal to the sum of the individual amplitudes of the original waves. Stimulated emission is the process that the laser works on, which was first proposed by Albert Einstein in 1917. When a sufficient number of a ...

... orbit a central nucleus, composed of protons and neutrons. each electron carries one negative charge and each proton one positive charge. Neutrons carry no charge. Every atom has the same number of electrons as there are protons, so, on the whole, it is electrically neutral. The electrons have discrete kinetic energy levels, which increase with the orbital radius. When atoms bond together to form a solid, the electron energy levels merge into bands. In electrical conductors, these bands are continuous but in insulators and semiconductors there is an "energy gap", in which no electron orbits can exist, between the in ...

... have them. Through your family history and genetics test of amniotic fluid doctors can tell whether an unborn baby has one. These disorders can ranges from slight retardation, to downs syndrome to even a higher risk for heart disease later in life. Chronic and Degenerative Diseases are diseases that go on for a long time or return from time to time over a long period. Usually they can not be cured but many can be helped by medical treatment. Chronic diseases are also degenerative. Such diseases gradually lead to the breakdown of tissues and organs of the body. is a Chronic Degenerative Disease. is the irre ...

... crabs do not reproduce in captivity. Instead, they mate on land near the sea. After the eggs develop, the female carries the eggs on her abdomen to the sea where she leaves them on wet sand or a wet rock for the tide to carry them out to sea. There are usually 1,000 to 50,000 eggs at a time. They are small larvae at sea where they molt several times in order to grow to reach the characteristics of a typical adult hermit crab. After reaching the adult larvae stage, the hermit crabs begin looking for a shell to live in. Once they mature and find a suitable shell, they come to live on land for the rest of their lives ...

... (with the exception of the reversible s). The course of AD can range anywhere from 1.5 to 15 years with an average of about 8.1 years (Terry , 1988). AD is usually divided into three stages mild, moderate, and severe. Throughout these stages a specific sequence of cognitive deterioration is observed (Lezak, 1993). The mild stage begins with memory, attention, speed dependent activities, and abstract reasoning dysfunction. Also mild language impairments begin to surface. In the moderate stage, language deficits such as aphasia and apraxia become prominent. Dysfluency, paraphasias, and bizzare word combinations ...

... to keep the trajectory low enough so that the ball will reach the fence. Trajectory is also seen in basketball, where players must shoot the ball with enough arch to get over the front of the rim, and go through the hoop. The energy required to do this comes from not only the arms, but the legs as well. The medical field has seen enormous breakthroughs because of principles of physics. Doctors are now able to use lasers for surgery. Lasers are based on the physical principle of light, and are devices for the creation and amplification of a narrow, intense beam of coherent light. New laser microsurgery ...

... affluenza can be cured and maybe prevented. In analyzing affluenza I hope to shed insight those possibilities. There is a disease that is sweeping the U.S. at an alarming pace. It is called affluenza it is very contagious and growing at frightening rates. In 1997, an amazing 1.1 million debt plagued spenders filed for personal bankruptcy that was a 28.6% increase from '96. Economists predict another 1.6 million to file by the end of this fiscal year, (Shop 'til We Drop [STWD], 1997). These are two vivid examples of the amazing rate at which affluenza is growing. These numbers are occurring Causes & Cures desp ...

... messages to other towns through a thing called “wiring� basically it’s communication using morse code. They also had an extremely slow mailing service, that took weeks to meet it’s desired destination, because they had to walk on foot or on horse back. There were no cars, and there were no airplanes, only there own two legs, and a horses. Something needed to be done. It took way too long to get into contact with people, and it took the same amount of time to get a response. In 1886, a man by the name of Alexander Graham Bell developed an interesting object, that gave you the capability of talking live w ...

... All cell organelles are being produced in quantity and the chromosomes - DNA molecules are being copied exactly. The two identical copies of DNA are called a "pair of chromatids" and they are linked together by an item called a "chromomere". During this stage a store of ATP is also built up. [Best put a labelled diagram of a cell during Interphase here.] Prophase --------------------------------------- In this second stage changes to the cell become visible. The chromosomes condense, coiling up to about 5% of their original length, now clearly visible when a stain is added. The centrioles move to the opposit ...

... of the communication was almost absence . The need for networks appears for the first time when Graham Bell set in use the telephone . He was talking with a friend of his with a single line , but later when he wanted to talk to another friend of his he needed to use another line to connect his phone and the phone of his friend . So imagine that he has X friends , he would need X(X-1)/2 lines and X-1 phones , that was impossible so the need of networks come up . The network first developed for the need of the voice communication but after the appearance of data communications need the same network was used . From ...