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Physics Honors/AP 1 and 2

Chapter 30: 8-13 Assignment

Course Materials are always under revision! Weblecture content may change anytime prior to two weeks before scheduled chat session for content.

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Physics 30: 8-13 Half-Lives and Decay Rates


Reading Preparation

Text Reading: Giancoli, Physics - Principles with Applications, Chapter 30, Sections 8 to 13

Study Points

Key Equations

Decay Rate Δ N   =   λ N Δ t   Δ N Δ t   = λ N   ΔN: decays
Δt: period of time
λ: decay constant for isotope
Radioactive Decay Law R   =   | Δ N Δ t |   =   R 0 e λ t R: rate at interval Δt
Δ: number of events
λ: decay constant
R0: Initial decay rate at t=0
Half-life T ½   =   ln   2 λ T: period for half of isotope nuclei to decay
λ: decay constant for isotope

Web Lecture

Read the following weblecture before chat: Half-Lives

Study Activity

Use the McGrawHill Radioactive Lab to determine the halflife of an element. Follow the lab instructions and watch the short video, then perform the observations needed to complete the lab.

Chat Preparation Activities

Chapter Quiz

Lab Work

If you want lab credit for this course, you must complete at least 12 labs (honors course) or 18 labs (AP students). One or more lab exercises are posted for each chapter as part of the homework assignment. We will be reviewing lab work at regular intervals, so do not get behind!