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Relative Dating & Half Life

Total questions: 29

Worksheet time: 2hrs 43mins

Name
Class
Date
1.
If 10 mg of iodine 131 is given to a patient, how much is left after 24 days? The half-life of iodine-131 is 8 days.
a)
1.25mg
b)
1.25g
c)
10g
d)
10mg
2.
The half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 g?
a)
3.0g
b)
0.25mg
c)
0.3g
d)
0.25g
3.

After 22,800 years, approximately what percentage of the original carbon-14 remains?

a)

15%

b)

12.5%

c)

6.25%

d)

3.125%

4.
What is the half-life of iodine-131?
a)
32 days
b)
8 days
c)
16 days
d)
24 days
5.

The % of the parent isotope remaining after 1 Half Life.

a)

50%

b)

25%

c)

12.5%

d)

6.25%

6.

The % of the parent isotope remaining after 2 Half Lives.

a)

50%

b)

25%

c)

12.5%

d)

6.25%

7.
Imagine you have 50,000 atoms of uranium-238. If U-238 has a half-life of 4.5 billion years, how many U-238 atoms will be left after 4.5 billion years? 
a)
25,000
b)
50,000
c)
12,500
d)
0
8.
If the half-life of uranium-232 is 70 years, how many half-lives will it take for 10 g of it to be reduced to 1.25 g?
a)
1 half-life
b)
2 half-lives
c)
3 half-lives
d)
4 half-lives
9.
Barium-122 has a half-life of 2 minutes. A fresh sample weighing 80 g was obtained. If it takes 10 minutes to set up an experiment using barium-122, how much barium-122 will be left when the experiment begins?
a)
0.25g
b)
2.5g
c)
25g
d)
80g
10.
After 4 half-lives, 1g of a sample of Krypton-85 remains unchanged.  What was the original mass of the sample?
a)
16g
b)
32g
c)
0.0625g
d)
4g
11.
What are the relative ages of the features in order from oldest to youngest?
a)
Limestone, Basalt, Fault, Siltstone
b)
Siltstone, Fault, Basalt, Limestone
c)
Limestone, Fault, Basalt, Siltstone
d)
Limestone, Siltstone, Fault, Basalt
12.
Which of the following is the oldest?
a)
Layer L
b)
Intrusion D
c)
Intrusion H
d)
Layer E
13.
Which of the following correctly lists the layers in order from oldest to youngest?
a)
A, B, C, D, E
b)
E, B, C, D, A
c)
E, D, C, B, A
d)
C, B, A, D, E
14.

Which layer is OLDER? Fault E or Intrusion D?

a)

Fault E

b)

Intrusion D

15.

Layer B on side #1 (left) is a match to which layer on side #2 (right)?

a)

z

b)

y

c)

w

d)

there is no match

16.
Letter "F" is a....
a)
inclusion
b)
intrusion
c)
fault
d)
unconformity 
17.

What is the most recent event?

a)

E

b)

B

c)

C

d)

D

18.

Above what layer is there an unconformity?

a)

H

b)

M

c)

R

d)

F

19.

What is the most recent event to happen?

a)

A

b)

B

c)

C

d)

D

20.
Which layering shown in the figure demonstrates disconformity?
a)
A. B
b)
B. C
c)
C. A
d)
D. None of these
21.
a)
C-E-D-B-A
b)
A-B-D-E-C
c)
A-D-B-E-C
d)
D-A-B-E-C
22.
a)
B-C-D-A-M-E-F-G-H
b)
E-M-A-D-C-B-H-G-F
c)
H-G-F-E-M-A-D-C-B
d)
H-G-A-D-C-B-F-E-M
23.
a)
B-F-A-C-G-E-I-D-H
b)
G-C-A-F-V-H-D-I-E
c)
E-H-I-D-B-C-G-A-F
d)
E-I-D-H-B-F-A-C-G
24.
a)
F-B-K-N-A-J-D-M-H-C-L-G-E
b)
F-H-B-K-E-G-L-C-N-M-D-J-A
c)
E-G-L-C-H-M-D-J-A-N-K-B-F
d)
F-M-H-C-L-G-E-B-K-N-A-J
25.
Which of the following correctly lists the layers in order from oldest to youngest?
a)
A, B, C, D, E
b)
E, B, C, D, A
c)
E, D, C, B, A
d)
C, B, A, D, E
26.
Which layer is the oldest ?
a)
A
b)
E
c)
D
d)
F
27.
Which letter indicates an igneous intrusion?
a)
A
b)
C
c)
D
d)
E
28.
The fault is older than layer B.
a)
TRUE
b)
FALSE
29.

What is the law of superposition?

a)

The age of sedimentary rock not found in the original layers.

b)

Metamorphic rock is younger than the nearby igneous rock.

c)

Sedimentary rock in it's original position is older than layers above it.

d)

Metamorphic rock is older because it was deposited to nearby sedimentary rock.

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