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Term

Radioactive Decay
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Radioactive dating I

TermDefinition
Radioactive Decay The natural breakdown of unstable atoms into more stable atom.
Absolute Age The actual age or date of an event or thing in years before the present.
Half Life The time required for half of the atoms in a given radioactive mass to decay.
The half-life for any given radioactive element is always the same
What will affect the half life of a radioactive isotope Nothing
which radioactive element would a scientist most likely have used to date the age of a fossil that is 10,000 years old Carbon -14
Why is carbon-14 not usually used to accurately date objects more than 50,000 years old? Carbon -14 has a relatively short half life and not enough carbon 14 has decayed after 50,000 years
The most reliable determinations of the age of the earth are obtained from studies of the half-life of certain radioactive minerals
radioactive element has a half life of 4.5 x 10 9th years? Uranium- 238
Where do you find radioactive elements half lives on Earth Science reference table? 1st page
If a radioactive element is placed under 50 tons of pressure, its half life will remain the same.
Samples of plant pollen are preserved in sediment deposited by the last glacial ice sheet in best for determining the age of the samples carbon -14
Carbon -14 all living, organic things
A whalebone that originally contained 200 grams of radioactive carbon-14 now contains 25 grams of carbon-14. How many carbon-14 half lives passed since this whale was alive 4
A rock sample containing the radioactive isotope potassium-40 is calculated to be 1.3 x 10 to the 9th years. How much of the original potassium would be left in this rock sample? 50%
If a specimen of a given radioactive substance is reduced in size, it's half life remains the same
A bone sample contains only 1/2 of its original radioactive c14 content. How old is the bones sample? 1 c14 half life
a Sample of rock contained 100 grams of potassium 40 when it was formed. Today the rock contains 50 grams of potassium-40. What is the age of the rock? 1.3X10 to the 9th years
Which radioactive isotope disintegrates to lead (pb206)? U238
Created by: sjjwhite
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