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Half Life Calculations

Authored by Lisa Thompson

Science

10th Grade

NGSS covered

Half Life Calculations
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15 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

If a radioactive isotope has a half-life of 10 years, how many years will it take for the isotope to decay to 1/8 of its original amount?

20 years

30 years

40 years

50 years

Tags

NGSS.HS-PS1-8

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The half-life of Bi-212 is 1 hour.  Suppose you put a 50.0 g sample of Bi-212 in your

locker before going to first period. How much would remain at the end of third period after 3 hours?


6.25

12.5

25

50

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

How much of a 500g sample of potassium-42 is left after 20 hours if the half life of potassium-42 is 5 hours?

30

31.25

250

125

Tags

NGSS.HS-PS1-8

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

According to the graph how long is the half life of this substance?

10 years

25 years

50 years

100 years

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the role of half-life in nuclear energy production?

It determines the amount of energy produced in a nuclear reaction.

It is used to calculate the safety measures needed in a nuclear plant.

It helps in determining the age of archaeological finds.

It is used to estimate the time a radioactive material can be used as a fuel source.

Tags

NGSS.HS-PS1-8

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Why is the concept of half-life important in the disposal of nuclear waste?

It helps in converting nuclear waste into non-radioactive materials.

It determines how long nuclear waste will remain hazardous.

It increases the decay rate of nuclear waste.

It decreases the amount of nuclear waste produced.

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What happens to the radioactivity of a material after one half-life?

It doubles

It remains the same

It is reduced by half

It is completely gone

Tags

NGSS.HS-PS1-8

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