Calculas
posted by Cratch .
In the early 1960s, radioactive strontium90 was released during atmospheric testing of nuclear weapons and got into the bones of people alive at the time. If the halflife of strontium90 is 32 years, what fraction of the strontium90 absorbed in 1965 remained in people's bones in 1996?

1996 is 31 years after 1965. Since the half life is 32 years, the amount of Sr90 is nearly, but not quite, reduced by half.
Fot the exact number,
N/No = 2^(31/32) = 0.511
Respond to this Question
Similar Questions

Calculus
[Exponential growth & decay] The halflife of radioactive strontium90 is approximately 29 years. In 1965, radioactive strontium90 was released into the atmosphere during testing of nuclear weapons, and was absorbed into people's … 
Calculus
The halflife of radioactive strontium90 is approximately 31 years. In 1960, radioactive strontium90 was released into the atmosphere during testing of nuclear weapons, and was absorbed into people's bones. How many years does it … 
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? 
calculus
In the early 1960s, radioactive strontium90 was released during atmospheric testing of nuclear weapons and got into the bones of people alive at the time. If the halflife of strontium90 is 27 years, what fraction of the strontium90 … 
Math
The halflife of radioactive strontium90 is approximately 28 years. In 1962, radioactive strontium90 was released into the atmosphere during testing of nuclear weapons, and was absorbed into people's bones. How many years does it … 
Math
The halflife of radioactive strontium90 is approximately 32 years. In 1961, radioactive strontium90 was released into the atmosphere during testing of nuclear weapons, and was absorbed into people's bones. How many years does it … 
Calculus
The halflife of radioactive strontium90 is approximately 31 years. In 1960, radioactive strontium90 was released into the atmosphere during testing of nuclear weapons, and was absorbed into people's bones. How many years does it … 
calculus
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) = (b) Estimate the … 
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? 
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 represents …