Topic: PhET: Free online physics, chemistry, biology, earth.

What is PhET? Founded in 2002 by Nobel Laureate Carl Wieman, the PhET Interactive Simulations project at the University of Colorado Boulder creates free interactive math and science simulations.

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Decay & Half Life Plexus-NSD Decay & Half Life. Why is this chapter on half-life being presented? The purpose of this chapter is to explain the process of radioactive decay and its relationship to the concept of half-life.

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Nuclear Chemistry: Half-Lives and Radioactive Dating Scientists look at half-life decay rates of radioactive isotopes to estimate when a particular atom might decay. A useful application of half-lives is radioactive dating.This has to do with figuring out the age of ancient things.

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FAQs: Radiation from Fukushima : Woods Hole Oceanographic. On March 11, 2011, a magnitude 9.0 earthquake—one of the largest ever recorded—occurred 80 miles off the coast of Japan. The earthquake created a series of tsunamis, the largest estimated to be over 100 feet, that swept ashore.

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Famous Scientists - The Third Millennium Online! 638-548 B.C. Thales of Miletus - Greek philosopher; developed theory of matter based upon water; recorded the attractive properties of rubbed amber and lodestone.: c.540-475 B.C. Heraclitus - Greek philosopher; first of the Greeks to develop a theory of the human soul; he praised its creative resources and spoke of the importance of self-exploration; he spoke of the logos that is common to all.

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HASPI Curriculum The HASPI Curriculum Resources are available free for use by educators. All of the resources align with the Next Generation Science Standards (NGSS) and Common Core State Standards (CCSS).

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Geology | science | Britannica.com Geology: Geology, the fields of study concerned with the solid Earth. Included are sciences such as mineralogy, geodesy, and stratigraphy. An introduction to the geochemical and geophysical sciences logically begins with mineralogy, because Earth’s rocks are composed of minerals—inorganic elements or

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Ionizing radiation - Wikipedia Ionizing radiation is categorized by the nature of the particles or electromagnetic waves that create the ionizing effect. These have different ionization mechanisms, and may be grouped as directly or indirectly ionizing.

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Risks of Nuclear Power Plants and Radioactive Waste. Radioactive Waste. But perhaps the biggest challenge that comes with nuclear power is how to deal with the disposal of the radioactive waste that is generated during nuclear fission.

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NRC: 10 CFR Part 20—Standards for Protection Against Radiation PART 20—STANDARDS FOR PROTECTION AGAINST RADIATION. Part Index. Subpart A—General Provisions. 20.1001 Purpose. 20.1002 Scope. 20.1003 Definitions.