Physics, 29.03.2020 22:34 snowprincess99447
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13. Radio-carbon dating is used to estimate the age of objects that were once living as all living
things contain a small amount of Carbon-14, which has a half-life of 5700 yrs. By measuring the
activity (counts min") of the dead tissue its approximate age can be determined. Show all the
steps in your working out.
a. A sample of living wood has an activity of 16 counts min per gram. Calculate the activity
of a 20g sample of living wood.
b. Calculate the activity of 20g sample of wood from a tree that died 17100 years ago.
State the correct units in your answer.
C. A5g of old wood from an archaeological site has an activity of 20 counts min?, what was
the activity of the wood when it was living? How long ago did the tree died?
Answers: 3
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As a pendulum bob swings back and forth several times, the maximum height it reaches becomes less and less. this is because more and more of the pendulum bob's energy is being transformed into a. heat energy b. kinetic energy c. potential energy d. kinetic energy and potential energy
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