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WorksheetsFinal Exam: Calculating Half Life
Total questions: 7
Worksheet time: 1hrs 4mins
Name
Class
Date
1.
An Isotope of Cesium-137 has a half life of 30 years. If 1.0 g of Cesium-137 disintegrates over a period of 90 years, how many grams of Cesium-137 would remain?
a)
.125 grams
b)
45 grams
c)
.5 grams
d)
15 grams
2.
Actinium-226 has a half life of 29 hours. If 100 milligrams of Actinium disintegrate over a period of 58 hours, how many milligrams of Actinium will remain?
a)
100 mg
b)
50 mg
c)
25 mg
d)
58 mg
3.
Selenium-83 has a half life of 25 minutes. How many minutes would it take for a 20 milligram sample to decay and only have 1.25 milligrams of it remaining?
a)
25 minutes
b)
50 minutes
c)
75 minutes
d)
100 minutes
4.
What is the half life of Polonium-218 if 0.0625 grams remains of a 2.00 gram original sample after 15 minutes?
a)
5 minutes
b)
3 minutes
c)
15 minutes
d)
7.5 min
5.
You have 100 grams of radioactive C-14. The half life of C-14 is 5730 years.
How many grams are left after 1 half life?
How many grams are left after 1 half life?
a)
100 grams
b)
25 grams
c)
2 grams
d)
50 grams
6.
You have 100 grams of radioactive C-14. The half life of C-14 is 5730 years.
How many grams are left after 2 half lives?
How many grams are left after 2 half lives?
a)
100 grams
b)
25 grams
c)
50 grams
d)
14 grams
7.
What was the most direct cause of the Chernobyl nuclear accident?
a)
unpredictable reactor behavior
b)
human error
c)
design flaws
d)
flawed regulations
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