Definition of Quarks in Physics

A quark is one of the fundamental particles in physics. They join to form hadrons, such as protons and neutrons, which are components of the nuclei of atoms. The study of quarks and the interactions between them through the strong force is called particle physics. The antiparticle of a quark is the antiquark. Quarks and antiquarks are the only two fundamental particles that interact through all four fundamental forces of physics: gravitation, electromagnetism, and the strong and weak interactions. Quarks and Confinement A quark exhibits confinement, which means that the quarks are not observed independently but always in combination with other quarks. This makes determining the properties (mass, spin, and parity) impossible to measure directly; these traits must be inferred from the particles composed of them. These measurements indicate a non-integer spin (either 1/2 or -1/2), so quarks are fermions and follow the Pauli Exclusion Principle. In the strong interaction between quarks, they exchange gluons, which are massless vector gauge bosons that carry a pair of color and anticolor charges. When exchanging gluons, the color of the quarks change. This color force is weakest when the quarks are close together and becomes stronger as they move apart. Quarks are so strongly bound by the color force that if there is enough energy to separate them, a quark-antiquark pair is produced and binds with any free quark to produce a hadron. As a result, free quarks are never seen alone. Flavors of Quarks There are six flavors of quarks: up, down, strange, charm, bottom, and top. The flavor of the quark determines its properties. Quarks with a charge of (2/3)e are called up-type quarks, and those with a charge of -(1/3)e are called down-type. There are three generations of quarks, based on pairs of weak positive/negative, weak isospin. The first generation quarks  are up and down quarks, the second-generation quarks  are strange, and  charm quarks, the third generation quarks are top and  bottom quarks. All quarks have a baryon number (B 1/3) and a lepton number (L 0). The flavor determines certain other unique properties, described in individual descriptions. The up and down quarks make up protons and neutrons, seen in the nucleus of ordinary matter. They are the lightest and most stable. The heavier quarks are produced in high-energy collisions and rapidly decay into up and down quarks.  A proton is composed of two up quarks and a down quark. A neutron is composed of one up quark and two down quarks. First-Generation Quarks Up quark (symbol u) Weak Isospin: 1/2Isospin (Iz): 1/2Charge (proportion of e): 2/3Mass (in MeV/c2): 1.5 to 4.0   Down quark (symbol d) Weak Isospin: -1/2Isospin (Iz): -1/2Charge (proportion of e): -1/3Mass (in MeV/c2): 4 to 8   Second Generation Quarks Charm quark (symbol c) Weak Isospin: 1/2Charm (C): 1Charge (proportion of e): 2/3Mass (in MeV/c2): 1150 to 1350   Strange quark (symbol s) Weak Isospin: -1/2Strangeness (S): -1Charge (proportion of e): -1/3Mass (in MeV/c2): 80 to 130   Third Generation Quarks Top quark (symbol t) Weak Isospin: 1/2Topness (T): 1Charge (proportion of e): 2/3Mass (in MeV/c2): 170200 to 174800   Bottom quark (symbol b) Weak Isospin: -1/2Bottomness (B): 1Charge (proportion of e): -1/3Mass (in MeV/c2): 4100 to 4400

Impact of International Trade in Nigeria - 6120 Words

AN EMPIRICAL ANALYSIS OF THE IMPACT OF TRADE ON ECONOMIC GROWTH IN NIGERIA AN EMPIRICAL ANALYSIS OF THE IMPACT OF TRADE ON ECONOMIC GROWTH IN NIGERIA MIKE I. OBADAN DEPARTMENT OF ECONOMICS AND STATISTICS UNIVERSITY OF BENIN BENIN CITY AND OKOJIE, I. ELIZABETH DEPARTMENT OF ECONOMICS AND STATISTICS UNIVERSITY OF BENIN BENIN CITY ABSTRACT Many economists generally agree that openness to international trade accelerates development. The relationship between trade and growth is envisaged through an export led growth strategy, following the theory that sustained trade is the main engine of economic growth. This paper examines the impact of trade on economic growth in Nigeria. Using time series data, a regression analysis was carried†¦show more content†¦Chenery and Strout (1994) asserted that for a long time, there was hardly any country which exhibited sustained growth rate higher than its growth of exports. They also claim that growth rates of individual developing countries since 1950 correlate better with their export performance than with any other single economic indicator. Thirlwall (1997) in his work, explained the possibility that export growth may set up a vicious cycle of growth such that once a country is launched on the path, it maintains its competitive position in world trade and performs continual ly better relative to other countries. He also contended that export growth relieves a country of balance of payments constraints so that the faster exports grow, the faster output growth can be without running into balance of payments difficulties. His findings suggest that an export based strategy of development offers the best prospects for economic growth. Although theoretical links between trade and economic growth have been extensively discussed for over two centuries, a lot of controversies still abound concerning their real effects. 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Features of the class Insecta Example For Students

Features of the class Insecta Question Answer What are the main body parts of an insect Head, Thorax, and Abdomen All arthropods, and therefore all insects, have Segmented bodies, Jointed legs, Exoskeleton, and are Invertebrates What is the main function of an insects antennae To sense the world around them Most insects have how many pairs of wings? Two pairs, Four wings total What part of the insect contains the digestive and reproductive organs? Abdomen Insects breathe through which body part? Spiracles What is the most diverse group of animals? Insects What are the two main groups of insects Winged and Wingless What are some beneficial insects? Ants, bees, butterflies, and some beetles What are some harmful insects? Ticks, lice, flies, termites Name two social insects. Ants and bees What is a parasite? An organism that lives on a host, and is harmful to the host Insects, arachnids and crustaceans all belong to which phylum? Anthropoda What are the three purposes of an exoskeleton? Camouflage, protection, support What is the field of view for 40 level of magnification? 4.0 mm What is the field of view for 100 level of magnification? 1.5 mm What is the field of view for 400 level of magnification? 0.4 mm What is the magnification of the eyepiece? 10x On a microscope, you should put the specimen on the _____? Stage When you shift from low power to high power, will the field of view increase or decrease? decrease On the highest level of magnification, what knob should you use? The fine adjustment knob.