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AST101-Chapter 6&7.txt

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Department
Astronomy
Course
AST101H5
Professor
John Lester
Semester
Fall

Description
Chapter 6 Earth and Terrestrial PlanetsEarth as a Planet1 Geology studies Earth in great detail2 Astronomy studies Earth differently1 to determine Earths general planetary properties some of this is from Chapter 62 to use Earths general properties to guide our investigation of other planetsparticularly the other terrestrial planetsHow Old is Earth1 Earths age is measured using methods from Chapters 5 and 62 Recall chemical elements occur as different isotopes Chapter 51 examples Carbon1212C 6 protons and 6 neutrons 13C6 protons and 7 neutrons and 14C6 protons and 8 neutrons3 Some isotopes are naturally radioactiveWhat are Radioactive Isotopes1 Radioactive isotopes are unstable they change or decay spontaneously into isotopes of other elements emitting particles2 The rate of decay does NOT depend on the environment temp pressure3 The rate of decay depends only on the properties of the atomic nucleus4 The decay rate is expressed as the halflifetime for
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