HW-15s - 1. Consider the atom denoted by 183 Au 79 The...

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1. Consider the atom denoted by Au 79 183 Þ The common name of this element is: gold It has electrons, protons, and neutrons. 79 79 183 79 104 œ This atom is radioactive and decays by alpha decay with a half-life of 49 seconds. Determine the fraction of its atoms that decay in each second (i.e., determine its decay constant). 0.693 0.693 49 s 0.0141/s. - œÐ ÑÎ> ÎÐ Ñœ 1/2 Write down the decay of this atom and determine the new atom that results. Au He Ir (iridium) 79 183 4 179 2 77 p The new atom has protons and neutrons in its nucleus. 77 102 2. Consider the atom denoted by Au 79 199 Þ It has electrons, protons, and neutrons. 79 79 120 This atom is radioactive and decays by beta decay with a half-life of 3.15 days. Determine the fraction of its atoms that decay in each second (i.e., determine its decay constant). 0.693 0.693 3.15 days 24 h/day 60 min/h 60 s/min - Ñ 1/2 2.55 10 /s. œ‚ 6 Write down the decay of this atom and determine the new atom that results.
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This note was uploaded on 02/11/2012 for the course PHYSICS 112 taught by Professor Fretwell during the Summer '08 term at Iowa State.

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HW-15s - 1. Consider the atom denoted by 183 Au 79 The...

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