WorksheetsAbsolute Dating Practice
Total questions: 10
Worksheet time: 11mins
Name
Class
Date
1.
Scientists use radioactive decay to measure...
a)
relative time
b)
absolute time
c)
half-lives
d)
time of day
2.
The length of time required for half of the radioactive atoms in a sample to decay is its...
a)
era
b)
age
c)
half-life
d)
eon
3.
How does absolute age differ from relative age?
a)
only absolute dating indicates which rock is older than another
b)
only absolute dating finds the age in years
c)
only relative dating finds the age in years
4.
Radiometric dating is possible because the rates of decay of radioactive isotopes _____.
a)
change over time
b)
change from place to place
c)
are constant
d)
vary widely
5.
What is the half-life of iodine-131?
a)
32 days
b)
8 days
c)
16 days
d)
24 days
6.
The % of the parent isotope remaining after 2 Half Lives.
a)
50%
b)
25%
c)
12.5%
d)
6.25%
7.
A bone was that originally had 10 grams of Carbon 14 now has about 1.25 grams. How many YEARS have passed? (not half lives)
a)
3
b)
5730
c)
6000
d)
17,200
8.
Unstable atoms that decay (change) and are considered radioactive
a)
Isotope
b)
Half-Life
c)
Absolute Dating
d)
Radiometric Dating
9.
The % of the parent isotope remaining after 1 Half Life.
a)
50%
b)
25%
c)
12.5%
d)
6.25%
10.
The % of the parent isotope remaining after 2 Half Lives.
a)
50%
b)
25%
c)
12.5%
d)
6.25%
100 %
