10 Questions | Total Attempts: 490  Settings  Complete the following 10 questions that test your knowledge and understanding of radioactive half life.

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• 1.
Examine the diagram modeling radioactive decay of some material. If two more half lives occurred, how many Parent element atoms (boxes) will remain?
• A.

12

• B.

6

• C.

3

• D.

1.5

• 2.
Examine the diagram and answer the following question. How many original Parent atoms (boxes) did this "rock" start with?
• A.

0

• B.

6

• C.

12

• D.

24

• 3.
Examine the diagram and answer the following question. How old is this "rock" if each half life is 3,000 years?
• A.

0 Yrs

• B.

1,500 Yrs

• C.

3, 000 Yrs

• D.

6, 000 Yrs

• 4.
Examine the diagram and answer the following question: After 3 half lives, approximately how much (percentage) of the original parent radioactive element is remaining?
• A.

50%

• B.

25%

• C.

12.5%

• D.

6.25%

• 5.
Examine the graph below and answer the following question: If each half life of this radioactive element is 500 years and a rock with this element is 2,000 years old, what percentage of the original element is remaining in this rock?
• A.

50%

• B.

25%

• C.

12.5%

• D.

6.25%

• E.

3.125%

• 6.
The following graph shows the decay of a radioactive parent element over time. How many half lives have occurred after   15 hours?
• A.

2 half lives

• B.

3 half lives

• C.

4 half lives

• D.

5 half lives

• E.

6 half lives

• 7.
If I have approximately 125 atoms of my original parent element, approximately how old is the rock?
• A.

3 hrs

• B.

6 hrs

• C.

9 hrs

• D.

12 hrs

• 8.
If this graph demonstrates radioactive half life and decay, what is the approximate half life?
• A.

1.5 hrs

• B.

3 hrs

• C.

6 hrs

• D.

Cannot be determined

• 9.
If Carbon-14 has a half life of 5,730 years, how old is a fossil if it has undergone 4 half lives?
• A.

5, 730 yrs

• B.

11, 460 yrs

• C.

17, 190 yrs

• D.

22, 920 yrs

• E.

28, 650

• 10.
If you need 5 % of radioactive Silicon by 4 p.m. to create an explosive to blow up your neighbor's dog house (the dog leaves "gifts" in your yard), will you have enough if the original sample starts undergoing decay when you leave for school at 8 am? (The half life for radioactive Silicon is 2 hours).
• A.

Yes, 3 half lives will have occurred and more than 5% remains

• B.

Yes, 4 half lives will have occurred and more than 5% remains

• C.

No, 3 half lives will have occurred and less than 5% remains

• D.

No, 4 half lives will have occurred and less than 5% remains