news_050911 - = ⇒ ν or ν gamma A radioactive sample’s...

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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
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Unformatted text preview: = ⇒ ν or ν , gamma A radioactive sample’s activity is λ 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 =-λ N = ⇒ λ ≈ -Δ N N Δ t = ⇒ N ( t ) = N e-λ t where N ≡ N ( t = ) half-life t 1 / 2 related to λ by λ = ln 2 / t 1 / 2 The Wang calculator, circa 1968...
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