The laser is a device that a beam of light that is both scientifically and practically of great use because it is coherent light. The beam is produced by a process known as stimulated emission, and the word "laser" is an acronym for the phrase "light amplification by stimulated emission of radiation."
Light is just like radio waves in the way that it can also carry information. The information is encoded in the beam as variations in the frequency or shape of the light wave. The good part is that since light waves have much higher frequencies they can also hold much more information.
Not only is the particle the smallest light unit but it is a particle as well as a wave. In beams of light whether they are ordinary natural or artificial the photon waves will not be traveling together because they are not being emitted at exactly the same moment but instead at random short bursts. Even if the light is of a single frequency that statement would also be true. A laser is useful because it produces light that is not only of essentially a single frequency but also coherent, with the light waves all moving along in unison.
Lasers consist of several components. A few of the many things that the so-called active medium might consist of are, atoms of a gas, molecules in a liquid, and ions in a crystal. Another component consists of some method of introducing energy into the active medium, such as a flash lamp for example. Another component is the pair of mirrors on either side of the active medium which consists of one that transmits some of the radiation that hits it. If the active component in the laser is a gas laser than each atom is characterized by a set of energy states, or energy levels, of which it may consist. An example of the energy states could be pictured as a unevenly spaced ladder which the higher rungs mean higher states of energy and the lower rungs mean lower states of energy. If left disturbed for a long time the atom will reach its ground state or lowest state of energy. According to quantum mechanics there is only one light frequency that the atom will work with. There are three ways that the atom can deal with the presence of light either it can absorb the light, or spontaneous emission occurs, or stimulated emission occurs.
Hitler had many motives to why he did so. To Hitler Jews were maggots, a virus that had to be eliminated. He saw himself as the German Messiah doing God’s work by destroying the Jew. Hitler and the Nazis considered the Jew to be like the devil, wishing to dominate the world. When Hitler saw the image of a Jew, he saw an image of Satan. It wasn’t just Jews he wanted to destroy, but he saw the Jews as the main problem, and wanted to destroy them before they infected the entire world. He made himself the supreme racist. All he could think about was murder. He wanted one perfect race of people, all under one nation, with one leader, him.
Everybody knows Christopher Columbus sailed the ocean blue, but does everyone know what he did after he got to America? Even though Christopher columbus was a great explorer and a brave leader to modern civilization, he did not treat everyone fairly after he got to America, especially the Native-Americans. Christopher Columbus kicked the Native-Americans out and brought european diseases, he gave Natives junky things like glass beads in return for great stuff like gold, and now the state of california is changing Columbus day to indigenous peoples day. So all in all Christopher Columbus is a bad person to celebrate after all of the horrible things he did to the Native-Americans .
Laser is an acronym used for Light Amplification by Stimulated Emission of Radiation. Laser treatment is a procedure used to cure skin problems with a strong beam of light. Experienced cosmetologists and dermatologists use this new technology to cure many ailments.
Oral and Maxillofacial surgery was the forerunner in using laser. There were attempts to replace surgical scalpel with electrocautery and later with laser. Some of the added advantages of Laser are
Columbus’s brutality would soon come to an end. Freeland describes, Because of Colon 's reckless murder of native peoples, along with the devastation of European diseases introduced to the already weakened Indian population, the tribute system quickly began to break down by 1496 due to a shortage of native labor. Basically to sum it up Columbus killed all his slaves, and this was not a quick death either. These indigenous people suffered dearly at the hands of this “Conqueror” as we like to call
Hitler was successful in activating a group identity within the German population when he associated Jews as the enemy and Aryans as the dominant race who would save the world from the Jews. By making the Aryan Germans group identity salient he created an in-group/out-group relationship between the Aryans and the Jews. This in-group/out-group relationship leads to group bias which affects how people perceive others that are not part of their group. By cultivating the idea that the Jews were different than the Aryans, Hitler was able to successfully create a divide between
From lying to his crew, to cheating the Natives out of their valuables, he was dishonest, untrustworthy, and misguided. As a person who claimed to be a “Christian”, he showed no signs of how a Christian should act according to the Bible. His motives were very wrong, for he was only in the pursuit of treasure and fortune. He had no concern over his crew when they were ready to turn back so that they would not get lost at sea which shows his selfishness, stinginess and greed. As one can see, Christopher Columbus had many downfalls and not small problems that one can oversee, but large mistakes and very apparent character flaws. As Americans we should give credit where credit is due and I think we should not waste time giving credit to people who don’t deserve it, but to the real heroes that do not get
To be eligible to become a real estate agent, he or she must first be a high school graduate, be at least 18 years of age, and pass a written test. In every state real estate agents must obtain a state license to sell and rent properties. Over 1,000 universities, colleges, and junior colleges offer courses in real estate. Many local real estate associations sponsor courses covering...
The difference between the original discovers and Columbus was preservation of life. (Whoever discovered it first) and (whoever else 's) Came respecting the land, whereas Columbus and his men destroyed everything, committing mass genocide and killing nature to settle in the area. When Columbus first discovered the land, he landed in the Bahamas, returning to spain with captured natives as a gift to their majesties. He then returned again, landing in the Hispaniola. Creating a short lived colony and returning back to Spain again. On his third voyage, he and when the native went out to the ship to greet the sailors. Once on the ship, it was noticed that they wore tiny gold ornaments in their ears. If Columbus wasn 't coming back empty handed and definitely not without gold. Once he reported to the king and queen in an exaggerated letter that there was gold everywhere, he returned to back to Spain. When he got to Spain, he was granted 17 ships and more than 1,200 men. Promising to deliver, he began his search for gold. Instead of commanding his men to search for the gold, he had them enslave the indigenous people to search for it. Forced to supply a certain amount of gold every three months, earning a copper necklace when achieving thier goal, and getting their hands cut off and hung around their neck. With the lack of gold in the area, approximately 10,000 of the slaves died handless. In the first couple years of thier search, around 250,000 aboriginals were dead. Many,
Light is both part particle and part wave. Light is “the electromagnetic radiation that may be perceived by the human eye”. It consists of photons, which are massless bundles of concentrated electromagnetic energy. Light’s lower frequency is red, and the higher frequency is blue. Like sound, light has frequencies humans can’t detect. Ultraviolet light is at a frequency higher than violet, and infrared is at the frequency lower than the red of visible light. We get UV (ultraviolet) rays from the sun, and infrared is used in night vision to see better.
Lasers were a remarkable technical breakthrough. Electronic engineer Theodore Maiman invented the first optical ruby laser. Initially, surgeries with lasers were introduced to prevent blindness caused by diabetic retinopathy. Later, in 1964, another electronic engineer Kumar Patel discovered the carbon dioxide laser (CO2). The CO2 laser has been used widely to treat some types o...
Light is what lets you experience colour. The pigment of the retina in your eyes is sensitive to different lengths of light waves which allows you to see different colours. The wavelengths of light that humans can see are called the visible colour spectrum.
of a gas, liquid, or other substance-are excited so that more of them are at
Within the rather disturbing short story, “The Yellow Wallpaper”, by Charlotte Perkins Gilman, Gilman expresses an underlying tone of women’s suppression. The narrator lived life as normal, under the domestic ideology. Without the realization of what was occurring to women in that era. Throughout the story, the narrator began to realize the social norm was suppressing women and their “voice”. She began to act different from what society view on ideal females. The narrator found the source and reasoning to why the people in her household and other acquaintances acted in such a manner. After putting the puzzle pieces together, she came to accept the reality. During the 1800s, African Americans were given the right to vote in which it essentially