interference theory goes against the cue dependant theory OTHER EXPLANANTION- Theory of forgetting fails to take into account biological factors that will also contribute to forgetting e.g. people with alzheim have lost memory because of neurological decay of memory trace‚ cue dependant theory suggests that a person forgets because the cue for learning and recall is different.
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the substance. By using these dating methods‚ scientists have been able to determine the age of many things for example‚ dead organisms‚ rocks‚ and even the Earth. One type of radio isotopic dating is recognized as carbon dating. The radioactive decay of carbon-14 is used in carbon dating. Carbon-14 atoms are equally distributed over Earth ’s biosphere. These atoms are combined with carbon-12 and carbon-13. Organisms contain the same ratio of carbon-14 to carbon-12 and carbon-13 because organisms
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Scientists call unstable isotopes radioactive. Radioactive decay * Radioactive isotopes tend to break down into stable isotopes of the same or other elements. * Refers to the process in which a radioactive form of an element is converted into a decay product at a regular rate. - This dating is not a single method of absolute dating but instead a group of related methods for absolute dating of samples. * Because radioactive decay occurs at a steady rate‚ * Scientists can use the
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process of change is often referred to as the decay of atoms. * The rate of Radioactive decay is described in half-lives. * Energy is released during radioactive decay Types of Nuclear Radiation * When an unstable nucleus decays‚ particles and energy are given off from the decaying nucleus. * α and β radiation is in the form of particles * γ radiation is in the form of waves-kind of like light but higher frequency . Nuclear Decay * Alpha particles consist of two
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than its siblings K-39 and K-41 because K-40 is much less stable. K-40 has a half-life of approximately 1.35 billion years and is found in essentially everything on Earth. K-40 can undergo beta decay and can transform to two different atoms: Calcium-40 and Argon-40. Approximately 10.72% of beta decay is K-40 transforming to Ar-40 via electron capture. Electron capture occurs when a proton-saturated atom absorbs an electron from the inner shell and thus transforming a positively charged particle
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Write about the ways Tennyson tells the story in ‘Tithonus’ Tennyson tells the story of Tithonus with very mixed emotions. One minute he is in the depths of despair‚ and next confessing his desire for his lover. In Tithonus‚ a variety of techniques are used to show the narrator’s thoughts and feelings. One of the techniques involved is repetition. ‘Ay me! ay me!’ This repetition hints at how strong his despair is‚ slowly decaying but not dying as an immortal. The exclamation marks show that
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in the form of radiation‚ until a stable nucleus is produced; this is called the radioactive decay. Four isotopes as well as their uses are mentioned subsequently. Americium: Americium is a silvery metal‚ which corrodes slowly in air and is soluble in acid. It has the isotopes: Am-243‚ Am-242 and Am-241‚ with a half-life of 432 years‚ which was the first isotope to be isolated. The isotope Am-241 decays by emitting alpha particles and intense gamma radiation to become neptunium-237. Americium
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thin‚ they would lick them getting radioactive paint on their lips and in their mouth. Later‚ they suffered from various health problems (those were radium watches‚ not the tritium watches used today. It was changed because‚ unlike tritium‚ radium decays into radon gas and is toxic to the bones). The nuclear fallout from the two atomic bombs dropped on Japan was gruesome and brutal. When the Chernobyl reactor melted down and caught fire‚ several brave men had to fight those fires. Their gear‚ to this
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information. According to the concept of spreading activation‚ activating one memory node causes a ripple effect that spreads throughout its linkages to other nodes. The failure to retrieve something from memory is commonly known as forgetting. According to decay theory‚ memories grow weaker with the passage of time. Interference theory proposes that the chances of retrieving a particular piece of information become smaller as interference from other information becomes larger. • Free recall: a type
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Autoradiography Presenter: Miranda Grounds References: Alberts‚ p174-176‚ 730. Rogers A (1979) Techniques of autoradiography. 3rd Edition. Elsevier‚ North Holland pp429. Radiography is the visualisation of the pattern of distribution of radiation. In general‚ the radiation consists of X-rays‚ gamma (g ) or beta (b ) rays‚ and the recording medium is a photographic film. For classical X-rays‚ the specimen to be examined is placed between the source of radiation and the film‚ and the absorption
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