calculus

In the early 1960s, radioactive strontium-90 was released during atmospheric testing of nuclear weapons and got into the bones of people alive at the time. If the half-life of strontium-90 is 27 years, what fraction of the strontium-90 absorbed in 1962 remained in people's bones in 1994?

  1. 👍
  2. 👎
  3. 👁
  1. 1994-1962 = 32 years

    A = Ao*2^-t/27, so
    A/Ao = 2^-32/27 = .4397 = 43.97%

    1. 👍
    2. 👎
  2. 1994-1962 = 32 years

    (.5)^(1/27)=.974654

    .5 because half life

    .974654^32

    Answer: 43.977

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. math

    Suppose strontium-90 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)

  2. Calculas

    In the early 1960s, radioactive strontium-90 was released during atmospheric testing of nuclear weapons and got into the bones of people alive at the time. If the half-life of strontium-90 is 32 years, what fraction of the

  3. Calculus

    [Exponential growth & decay] The half-life of radioactive strontium-90 is approximately 29 years. In 1965, radioactive strontium-90 was released into the atmosphere during testing of nuclear weapons, and was absorbed into people's

  4. English

    When did home video game systems first become very popular? -in the late 1960s - in the mid-1970s*** - in the early 1990s

  1. chemistry

    What is the nuclear symbol for the radioactive isotope of copper with a mass number of 60?

  2. Chem 101

    In a fission reaction, uranium-235 bombarded with a neutron produces strontium-94, another small nucleus, and 3 neutrons. Write the nuclear equation for this reaction.

  3. Math

    The half-life of radioactive strontium-90 is approximately 32 years. In 1961, radioactive strontium-90 was released into the atmosphere during testing of nuclear weapons, and was absorbed into people's bones. How many years does

  4. Chemistry (PLEASE HELP)

    Which of the following statements are true? Fusion reactions result in nuclei with higher Z. To keep a nuclear power plant going, a chain reaction must be maintained. Nuclear fusion produces no long-lived radioactive by-products.

  1. Science

    Over the last several decades, scientists have addressed the problem of nonrenewable natural resources such as fossil fuels. Humans are using fossil fuels at a rapid rate and scientists believe that one day we will run out of

  2. social studies

    Which of the following are the main factors that led to World War I? Select the two correct answers. A. the rise of fascism in some European countries B. the invention of nuclear weapons and disagreement over their use** C. the

  3. Math

    The half-life of radioactive strontium-90 is approximately 28 years. In 1962, radioactive strontium-90 was released into the atmosphere during testing of nuclear weapons, and was absorbed into people's bones. How many years does

  4. Nuclear FIssion

    How does nuclear fission create energy? Nuclear energy is produced through the splitting, or fission, of a uranium atom in the core of a nuclear reactor. When hit by a neutron, the atom divides and releases two other neutrons, as

You can view more similar questions or ask a new question.