{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

news_051011 - ν gamma A radioactive sample’s activity is...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Stuff for Tuesday, May 10, 2011 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) =
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 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...
View Full Document

{[ snackBarMessage ]}