Post a New Question

Chemistry

posted by .

The half-life for radioactive decay of 14C is 5730 years (it emits β-particles with energy
of 0.16 MeV). An archaeological sample contained wood that had only 72% of the 14C
found in living trees. What is its age?

  • Chemistry -

    k = 0.693/t1/2
    Calculate k and substitute into the equation below.

    ln(No/N) = kt
    I would make up a convenient number for No, say 100, which makes N just 72% of that or 72. Calculate t.

  • Chemistry -

    thanks DrBob :)

  • Chemistry -

    2716 years

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Nuclear physics

    1) An old wooden tool is found to contain only 11.9 percent of 14C that a sample of fresh wood would. How many years old is the tool?
  2. Nuclear physics Repost

    1) An old wooden tool is found to contain only 11.9 percent of 14C that a sample of fresh wood would. How many years old is the tool?
  3. Chem/Physics

    Hi! I'm having lots of trouble figuring these two out.....if you could help that would be great- thanks!! 1. The half-life for the (first-order) radioactive decay of 14C is 5730 yr (it emits a β ray with an energy of 0.16 MeV). …
  4. Chem/Physics

    1. The half-life for the (first-order) radioactive decay of 14C is 5730 yr (it emits a β ray with an energy of 0.16 MeV). An archaeological sample contained wood that had only 72 percent of the 14C found in living trees. What …
  5. 12th grade

    The radioactive isotope of Carcon (^14C)has a half life of 5730. What is the decay constant of ^14C?
  6. Pre-Cal

    The radioactive isotope of Carcon (^14C)has a half life of 5730. What is the decay constant of ^14C?
  7. Calculus

    Many scientists believe that there have been four Ice Ages in the past 1 million years. Before the technique of carbon dating was known, geologists erroneously believed that the retreat of the Fourth Ice Age began about 25,000 years …
  8. algebra

    Scientists can determine the age of ancient objects by a method called radio carbon dating. The bombardment of the upper atmosphere by cosmic rays converts nitrogen to a radioactive isotope 14C of carbon with a half-life of about 5710 …
  9. chemistry

    Archeologists can determine the age of artifacts made of wood or bone by measuring the amount of the radioactive slope 14C present in the object. The amount of isolope decreases in a first-ordrr process. If 12.8% of the original amount …
  10. science

    Charcoal from an ancient campfire has a ratio of 14C to 12C that is one- fourth that of new wood. About how old is the charcoal?

More Similar Questions

Post a New Question