news_050911

news_050911 - = or , gamma A radioactive samples activity...

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Stuff for Monday, May 9, 2011 PS#10 back, PS #11 due up front; See me to go over midterm. Schedule this week back to usual: 1094 session on Wednesday, PS#12 due Thursday Quiz #6 on Friday on Q12–Q15 Unit T starts on Thursday Binding energy and decay rates: Binding energy E b E parts - E system , Δ m m parts - m sys = E b / c 2 nucleus: Δ m = Z m H + Nm n - m atom where m H = 1 . 007825 u m p = 1 . 007277 u m n = 1 . 008665 u m e = 0 . 0005486 u Decays: alpha, beta (neutron β - , proton β + , EC)
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Unformatted text preview: = or , gamma A radioactive samples activity is N , which is decays per second 1 becquerel = 1 Bq 1 decay per second; 1 curie = 1 Ci = 3 . 7 10 10 Bq dN dt =- N = - N N t = N ( t ) = N e- t where N N ( t = ) half-life t 1 / 2 related to by = ln 2 / t 1 / 2 The Wang calculator, circa 1968...
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news_050911 - = or , gamma A radioactive samples activity...

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