Lec 7 W 4 Th(Week 5 Tues Geoltime

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Unformatted text preview: tope to main daughter product Main daughter product can be isotope of same element to parent, or different element altogether if atomic number (i.e. number of protons)changes decay constant, based on half lives (rate of decay) - neutron, pro and neu combined, even out charges Alpha emission – nucleus of atom spontaneously emits alpha particle (equivalent to nucleus of helium atom), 4 atomic mass units and 2 atomic numbers. (electron) Beta emission emission of an electron (ß particle), which changes a neutron to a proton and thereby forms a new element without a change of mass. 14 - ex. bubble bath: time it took for the bubbles to go down or decay is the half life • Amount of time it takes for half of the original number of parent atoms in a sample to decay to daughter products • The percentage of radioactive atoms that decay during one half-life is always the same ( 50 percent) parent. isotope - time it takes to do the half life and second half life will be the same daughter product 11 15 5 1/25/2013 • • 37 38 • • • • • - ancient rocks, radiocarbon dating doens't work - divide time into pieces Combination of absolute dating with relative dating gave led to the Geologic Time Scale as we now know it. Eons Eras Periods Epochs - Larger units (longer duration) *million years at least 18 6 1/25/2013 - long Thinking on _____ time scales can have its advantages (more on this when we cover the dynamics of natural hazards). End of Lecture 7...
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This document was uploaded on 02/25/2014.

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