Recent content by cowboi123

  1. C

    Decay contant of xenon and strontium

    Homework Statement The decay constant of xenon-142 is 0.462(s^-1), and the decay constant of strontium-90 is 7.85*10^-10 (s^-1). Initially, a sample of radioactive waste material contains equal numbers of strontium-90 and xenon-142 nuclei. Calculate the time taken for the ratio: number...
  2. C

    Half-Life of Strontium-90 - Solve Here!

    Homework Statement The half life of strontium-90 is 28.0 years. Deduce that the decay constant of strontium-90 is 7.85 * 10^(-10) s^1. Homework Equations k = ln 2 over half-life in seconds The Attempt at a Solution dunno...please help me solve this!