
Half life and doubling time
Mathematics
9th - 12th Grade
CCSS covered
Used 14+ times

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9 questions
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1.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
The population of turtles is doubling every 3 months. If there are 400 turtles now, how many will there be in 2 years?
y = 104,200
y = 120,400
y = 102,400
y = 124,000
2.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
A bacterial colony doubles in size every 6 hours. There are 90 bacteria present initially. Estimate the population size after 80 hours. What is the answer?
982,914
914,928
928,914
914,914
Tags
CCSS.HSF.LE.A.4
3.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
James' 70 in. giant peach doubles in size every week. Write an expression that would represent how big the peach is after 5 weeks.
2,240
2,420
2,024
2,042
Tags
CCSS.HSF.BF.A.2
4.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
The population of a bacteria is doubling every 3 minutes. If there are 50 bacteria now, how many will there be in 7 minutes?
Approximately 152 bacteria
Approximately 352 bacteria
Approximately 252 bacteria
Approximately 452 bacteria
Tags
CCSS.HSF.LE.A.4
5.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Bacteria can multiply at an alarming rate when each bacteria splits into two new cells, thus doubling. If we start with only one bacteria which can double every hour, how many bacteria will there be after 24 hours?
16,777,261
16,727,216
16,777,216
16,277,716
Tags
CCSS.HSF.LE.A.4
6.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
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.
1.25mg
1.52 mg
.125 mg
125 mg
Tags
CCSS.HSF.LE.A.4
7.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
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?
2.5 g
250 g
0.52 g
0.25g
Tags
CCSS.HSF.LE.A.4
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