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chemistry
Strontium90 decays through the emission of beta particles. It has a halflife of 29 years. How long does it take for 80% of a sample of strontium90 to decay? Show process of how you got this
asked by Urgent Help on January 10, 2013 
Math
The element strontium90 is radioactive. The percent of strontium 90, A(t), left in a sample can be modelled by the halflife function A(t) = A0 (1/2)^t/29, where t represents the time, in years, after the initial time, and A0
asked by Emma on May 31, 2017 
Chemistry
The halflife for beta decay of strontium90 is 28.8 years. A milk sample is found to contain 10.3 ppm strontium90. How many years would pass before the strontium90 concentration would drop to 1.0 ppm?
asked by Mindy on November 11, 2011 
chem
Radioactive substances decay by firstorder kinetics. How many years would be required for a sample containing strontium90 to decrease to 58.32% of its initial activity? The halflife of strontium90 is 2.88e1 years.
asked by sara on February 22, 2014 
chemistry
What percent of the original sample of strontium90 (halflife = 28.9 years) will remain after the following time periods?after 18 years? after 47.5 years? after 1008 years?
asked by Anonymous on November 5, 2011 
SCIENCE
We did a radioactive decay and half life lab with m&ms and I do not understand these conclusion questions: 1. how many half lives would it take for 500 nuclei to decay to 6.25% of the original number of nuclei? My ans: 3125? do
asked by Bethany on November 27, 2014 
math
Suppose strontium90 decays at a rate of 2 percent per year. (a) Write the fraction P of strontium remaining, as function of t, measured in years. (Assume that at time t=0 there is 100 % remaining.) Answer: P(t)=(.98)^t (b)
asked by mac on September 14, 2017 
chemistry
Strontium90 has halflife of 28 years. if a 1.00mg sample was stored for 112 years. what mass of Sr90 would remain?
asked by bob on April 6, 2010 
Forensics
Strontium90 is a radioactive waste product from nuclear reactors. It has a half life of 29 years. How many years would it take for a quantity of strontium90 to decay 1/16 of its original mass?
asked by Rachel on August 31, 2016 
AP Environmental Science (URGENT)
Strontium90 is a radioactive waste product from nuclear reactors. It has a halflife of 29 years. How many years will it take for a quantity of strontium90 to decay to 1/16 (onesixteenth) of its original mass?
asked by Heather on January 11, 2012