Half Lives: Quantifying Radioactive Decay Over Time
Interactive Video
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Physics, Science
•
10th Grade - University
•
Hard
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7 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the main characteristic of radioactive decay?
It can be controlled.
It is a random process.
It is a predictable process.
It occurs at a constant rate.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How is the concept of half-life best described?
The time it takes for the number of nuclei to double.
The time it takes for half of the nuclei to decay.
The time it takes for the nuclei to stop decaying.
The time it takes for all nuclei to decay.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If a substance has a half-life of 40 seconds, how many nuclei remain after 80 seconds if you start with 10,000?
1,250
5,000
10,000
2,500
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What shape does the decay curve of radioactive nuclei typically take?
Circular
Quadratic
Exponential
Linear
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
After three half-lives, what fraction of the original radioactive nuclei remains?
1/8
1/16
1/4
1/2
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If 20% of a substance decays each year, what percentage remains after one year?
20%
40%
80%
60%
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many nuclei remain after three years if you start with 2000 and 20% decay each year?
800
1600
1280
1024
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