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Let's walk through a problem
without the formula first just to make sure that we get the concept
of half-life:
In
2000,
you buried 15
kg of Carbon-14 in your backyard. Someone digs it up in
the year 13,460.
How much Carbon-14 did they find?
OK, That's
11,460
years (which is two half-lives...)
After
5730
years, there'd be
7.5
kg.
After
5730
more years, there'd be
3.75
kg.
Now, let's do one
with the formula:
You discovered a new
radioactive isotope and named it boogonium (don't ask). It's
half life is 1.23
years. If you start with a sample of
45
grams, how much will be left in
6.7 years?
Plug this stuff in!
Grab a calculator!
YOUR TURN:
An alien radioactive
isotope has a half-life of
238
years. If you start with a sample of
8
kg, how much will be left in
100
years?
Continued on the
next
page
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