If you accidentally spill phosphorus-32 onto your shoe, how long would it take before 99.9 of the radioactive material has decayed so that you can safely wear the shoes again?

  1. 👍 0
  2. 👎 0
  3. 👁 423
  1. Is that 99.9% or some other value? You have no units.
    k = 0.693/t1/2
    Substitute and solve for k, then substitute k into the equation below.
    ln(No/N) = kt
    No = some convenient number like 100.
    N will be 0.1 if 99.9% of the atoms have decayed.
    k from above.
    Solve for t (in the same units as the half life is given).

    1. 👍 0
    2. 👎 1

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    The half-life of phosphorus-32 is 14.26 days. The decay constant is k=4.86×10−2/days. If you accidentally spill phosphorus-32 onto your shoe, how long would it take before 99.9% of the radioactive material has decayed so that

    asked by Anonymous on May 1, 2011
  2. Grammar usage

    Maurice accidentally stepped on the back of my shoe, and the shoe flew (off or off of) my foot.

    asked by Anonymous on June 5, 2011
  3. precalc

    A shoe manufacturer markets a new athletic shoe in a community of 500,000 people. The marketing representative convinces 35% of the community to buy the shoe. Additionally, each customer convinces 35% of his or her friends that

    asked by Anonymous on September 5, 2010
  4. PreCalc/Calc

    A pilot of a small plane was flying over an oil spill at an altitude of 10,000 feet. He found that the near edge of the spill had an angle of depression of 58 degrees and the far edge of the spill had an angle of depression of 44

    asked by Kailes on November 10, 2015
  5. physics

    A hang glider pilot is flying horizontally over an open field when her shoe falls off. She was going 23.0 m/s and was 81.0 m above the ground. How long did it take for the shoe to hit the ground?

    asked by sheri on October 8, 2015
  6. chemistry

    White phosphorus (P4) was used for a long time in military incendiary bombs and ordnances. White phosphorus reacts with oxygen in the air and burns at very high temperatures, so it sets things on fire. Calculate the change in

    asked by danny on February 7, 2015
  7. Chemistry

    Phosphorus pentachloride reacts to form phosphorus trichloride and chlorine gas when heated. A 2.00 liter vessel contains 0.020 moles of phosphorus trichloride and chlorine at equilibrium. How many moles of phosphorus

    asked by Ceamus Angelina on July 9, 2018
  8. FrEnCh

    What is a shoe verb? Evidently "acheter" is one of them because of it's accents. What are examples of other shoe verbs and what classifies them? Like, do they all have something to do with accents? I am french i can help you but

    asked by brie on April 23, 2007
  9. algebra

    A shoe company wants to gauge opinions of a new shoe design. They send out 100 pairs to people in four different cities, but because of cost constraints they can interview only 40 people total. They randomly choose 10 people from

    asked by Isiah on September 15, 2015
  10. Earth Science

    Were there any lessons learned from the Valdez Spill that helped contain the devastation of the BP spill in the gulf?

    asked by Vincent on September 21, 2011

More Similar Questions