WorksheetsAbsolute Dating of Rock
Total questions: 15
Worksheet time: 15mins
Name
Class
Date
1.
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
2.
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
3.
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
4.
If the half-life of a radioactive group of atoms is 100 years, then how old is the rock if there have been two half-lives?
a)
25 years
b)
200 years
c)
400 years
d)
800 years
5.
The original element that undergoes radioactive decay is known as the...
a)
daughter element
b)
half-life
c)
parent element
d)
carbon-14
6.
What is the half-life of iodine-131?
a)
32 days
b)
8 days
c)
16 days
d)
24 days
7.
What is the Half life of this isotope?
a)
5 seconds
b)
10 seconds
c)
15 seconds
d)
20 seconds
8.
What is the half life of Carbon-14?
a)
5730 yrs
b)
1.2 billion years
c)
713 million years
d)
1.3 billion years
9.
Some ELEMENTS can decay over time.
a)
True
b)
False
10.
The element that is the product of radioactive decay is known as the...
a)
daughter element
b)
half-life
c)
parent element
d)
carbon-14
11.
The Earth is estimated to be how old?
a)
4.6 Million years old
b)
6,000 years old
c)
4.6 Billion years old
d)
Who knows
12.
An element that has broken down and released particles and energy is said to be _______________.
a)
radioactive
b)
subatomic
13.
Scientists use radioactive decay to measure...
a)
relative time
b)
absolute time
c)
half-lives
d)
time of day
14.
What element is usually used to date fossils?
a)
uranium-235
b)
carbon-14
c)
mercury-203
d)
thorium-234
15.
What is the Half life of this isotope?
a)
5 seconds
b)
10 seconds
c)
15 seconds
d)
20 seconds
100 %
