Problem: For a p-electron‚ orbital angular moment is (A) √2h (B) h (C) √6h (D) 2h Solution: Orbital angular momentum L = √l ( l + 1 )h where h = h/2π ∴ L for p electron = √1 ( 1 + 1 )h = √2h ∴ (A) Problem: For which of the following species‚ Bohr theory doesn’t apply (A) H (B) He+ (C) Li2+ (D) Na+ Solution: Bohr theory is not applicable to multi
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Introduction Atomic Absorption Spectrometer (AAS) is an analytical equipment commonly used for the detection of heavy metals in particular sample. The first step to analysis in the AAS is the atomization of the desired element by converting it to a gaseous state. The atoms then absorb the energy emitted from the hollow cathode lamp corresponding to the desired element and a detector reads the signal and records the results. The results may be used quantitatively or qualitatively depending on the
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John Dalton was an English chemist‚ physicist‚ and meteorologist. Dalton was born in 1766. He is best known for his work in color blindness‚ and of course‚ his Atomic Theory. His theory gave us an idea about what the universe is really made up of‚ and he paved the way for many more important scientific discoveries after he died in 1844. His theory was simple: He stated that all matter is made of atoms. He based his theory on two laws: the law of conservation of mass and the law of constant composition
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there are many immigrants from United States. Historical events such as World War 2‚ and nuclear testing on the islands has a huge effect on the Marshall Islands‚ but the islands are still beautiful‚ and people keep their traditional life style. Robert Barclay‚ an author of the novel “Melal”‚ usually deals with U.S military occupation to the Marshall Islands. The author describes colonization‚ westernization and environmental damage to the islands by nuclear testing. When he was young‚ he used to
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his shop‚ "Atomic Landing" so great. The sense of community where everyone felt free to do as they wanted and be themselves had made it a hub for nerds of all intensities. Of course‚ it was only the ones that were the largest nerds that hung out right until close‚ forcing him to get a bit more gruff than the normally laid-back 6’ 2" male normally was. Even at his most forceful‚ though‚ he was barely intimidating. His height‚ while substantial‚ was supported by a lithe
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The Population Bomb a theory developed by Paul Ehrlich in the 1960’s predicted that in less than two decades the overpopulation of the world would not be able to sustain itself leading to mass starvation and deaths. To achieve a more balanced carrying capacity he argued that population control at the family level would be necessary for society to continue to function. This type of thinking led to the implementation of population control programs‚ such as female sterilization that was forced upon
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Atomic masses: Proton 1.672621777(74) × 10^-27 kg 1.007276466812(90) amu Neutron 1.674927351(74) × 10^−27 kg 1.00866491600(43) amu Electron 9.10938291(40) × 10^−31 kg 5.4857990946(22) × 10^−4 amu What is an Isotope? -An Isotope is an Atom with the same number of protons‚ but differing numbers of neutrons. Isotopes are different forms of a Single element. Elements and their uses to our human body Oxygen is the third most abundant element found in the sun‚ and it plays
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The People Bomb was a CNN film from 1992 that focuses on the many issues of economics and health due to the continuing swell of human population. The video examines the growth patterns of the population boom‚ which some countries are at the greatest risk‚ and what can be done to help. The video emphasizes the estimate that at the current population growth rate‚ there will be over three times the number of people on the earth at the end of the 21st century as there were at the beginning. This estimate
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In Robert McNamara’s memoir‚ In Retrospect‚ McNamara provides intimate details on the events surrounding both the Kennedy‚ and Johnson administration. Moreover‚ he reflects on the some of the most controversial issues surrounding the cold war era‚ specifically‚ the “the Tonkin Golf Incident”‚ and the resolution it gave way to. McNamara examines what he believes to be the key questions surrounding these events that have sparked debate for decades. Did attacks occur on two US naval warships in the
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Paper #4 At some point in most children’s lives they create an imaginary friend. This imaginary friend is created so the child feels special attention that they may not get from the people around them. In the stories “Charles” by Shirley Jackson and “Doby’s Gone” by Ann Petry‚ both Sue and Laurie lack attention from either their parents or peers. Laurie is led to create Charles because of his lack of attention from his parents. By creating Charles‚ he is indirectly getting attention without
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