... properties of both particle and waves. If we look for photons we will find them, but if we look for wave -like properties we can see them too. However, we cannot see both particle and wave properties at the same time. It is often useful to confine in an optical-cavity. This allows us both to make more intense , as well as select of a particular colour (or energy). ¨ travels at a speed of 2.99792458x10^{8} ms^{-1} ¨ When passing though matter, is slowed down by brief interactions, and so appears to travel more slowly. ¨ This "slowing down" is accounted for by the index of refraction of the matter. 's proper ...

... is so reactive that it never occurs free in nature. Chemical Properties Chlorine is in the halogen family, and like all the other halogen elements chlorine has a strong tendency to gain one electron and become a chloride ion. Chlorine readily reacts with metals to form chlorides, most of which are soluble in water. Chlorine also reacts directly with many nonmetals such as sulfur, phosphorus, and other halogens. Chlorine can support combustion; if a candle were to be thrown into a vessel of chlorine, it would continue to burn, releasing dense, black clouds of smoke, The chlorine combines with hydrogen of ...

... young star cluster, with an approximate age of less than one million years. It has even been speculated that some of the younger stars within the cluster are only 300,000 years old. The is an emission nebula because of the O-type and B-type stars contained within it. These high-temperature stars emit ultraviolet (UV) light that ionizes the surrounding hydrogen atoms into protons (H+) and electrons (e-). When the protons and electrons recombine, the electrons enter a higher energy level (n=3). Then, when the electron drops from the n=3 level to the n=2 level, an Hphoton is emitted. 2 This phot ...

... routes are stored on one single compact-disk. Imagine, simply insert the CD into the CD-driver in your car, and tell the computer where to go. Therest will be done automatically. This will be a safer, faster, and morecomfortable way to travel. Another new area, called "virtual reality" is currently being tested. This is away to simulate reality on a monitor. In order to feel this so-called realityyou have to wear special electronic glasses and an electronic suit. Fastened tothe suit are sensors, which send information to the main computer. Thiscomputer works with the data and displays them on the electronic sp ...

... is “a syndrome of childhood characterized by a lack of social relationship, a lack of communication abilities, persistent compulsive, rituals, and resistance to change� (Paluszny 1). For centuries, medical professionals have tried to understand autism and its origin. The above example shows only a few examples of autistic behavior. The history of autism extends, as far back as the late sixteenth century; however, during that time it was not identified as this illness. Here is a statement from before the discovery of the illness: In 1799, a boy about eleven years of age was found naked in the woods of Avery ...

... 1800's. Europeans sailing to North America would fill their ships ballast with wet sand taken from shores of Europe, a habitat where purple loosestrife thrived. Upon arrival in North America the ballast would be dumped overboard on the shoreline. By 1830 the plant was well established along the New England seaboard. Purple loosestrife seeds were also found in sheep and livestock feed that was imported from Europe during this period. This new organism was introduced to a new habitat free from traditional parasites, predators and competitors, purple loosestrife thrived in the environmental conditions and by 1 ...

... They heard something on the scanner and they had to come back their small marine institute off the coast of Connecticut. They marked their spot with a buoy and went about their way. That same day two fisherman were fishing and found the buoy that had the marine institute logo on it so they decided to take a dive. They ended up diving right down to the steel boxes that contained the "White Sharks". The men were curious and so they opened the box. Nothing happened at first and then glowing eyes caught their attention. One guy was killed. The other guy managed to get away and swim for about 200 yards and ...

... repositories for genes of living organisms. It is commonly used in the context of plant breeding as I described above, but it also applies to the freezing and the storage of animal sperm and embryos for use in animal husbandry or artificial insemination. An understanding of crop origins and variations is necessary in assembling genetic diversity in plant crops. In certain geographical areas there has existed a rich source of variability in crop plants but the encroachment of civilization has reduced the natural variability inherent in primitive plant forms and related species of crop plants. Agricultural process ...

... is the insecticide DDT which damages animal tissue and is dangerous to humans , this can be passed along the foodchain. Marine Environments : 80% of the waste which is pumped into the sea each year is produced by dredging, 10% is industrial waste and 10% is sewage. Some of the consiquences due to this are :- presence of toxic substances and the rapid uptake of contaminants by marine organisms to name but a few. Oil spillages either by tankers or offshore ridges cause devistating effects on the local environments. Oil is extremely dense which means it floats on top of the water and can kill fish and birds, ...

... and all forests and trees in general, is another. Every car produces enough gases from its exhaust into the atmosphere that takes a mature tree to clean in about five years. Trees keep the air clean for the environment by taking the gases in and produces oxygen out of it. By cutting down the trees we are allowing for more of the carbon to be exposed into the atmosphere. Another factor that most people would not consider in the raising of global warming is the excrement of cows. Cows produces tons of carbon that does not all get treated for, and is in the top five for highest amounts of carbon produced per year. ...