Nuclear Files

Videos:


Balancing nuclear rxs
Kinetics of nuc decay
18.1
Fission and fusion
Nuclear bombs

Notes:

When you have to find how much of a element decays, I like the following formula:
The time given divided by the half life time = the # of half lives. Then take the given mass (or number of atoms) and divide by 2^the number of half lives.
half.png

When you have simpler problems like when is 1/4 of the radioactive material decayed look at this pattern:
Assume that the material has a 2 day half life (could be any time period) and you start with 16 grams of material.
Time
passed

The amount of
radioactive substance

The fraction
decayed

The amount of non
radioactive material

The Fraction
not radioactive
0 days

16 g

all

0

none
2 days

8 g

1/2

8 g

1/2
4 days

4 g

1/4

12 g

3/4
6 days

2 g

1/8

14 g

7/8
8 days

1 g

1/16

15 g

15/16

nuclear.jpg
For Decay Constant Problems
2013-01-16_0928.png
You can use this graph to determine the time it take for activity to take place.
halflifegraph.png
One curie = 3.7 X 1010 decays/sec

Labs:




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