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Half-Life

Authored by Joshua Singletary

Science

9th - 12th Grade

NGSS covered

Used 25+ times

Half-Life
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10 questions

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1.

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1 min • 1 pt

The half-life of Zn-71 is 2.4 minutes. If one had 100.0g at the beginning, how many grams would be left after 7.2 minutes has elapsed?

2.

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1 min • 1 pt

Pd-100 has a half-life of 4 days. If one had 120g at the start, how much would be present after 20.0 days?

Tags

NGSS.HS-PS1-8

3.

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1 min • 1 pt

Os-182 has a half-life of 21.5 hours. How many grams of a 10.0 gram sample would have decayed after exactly three half-lives?

4.

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1 min • 1 pt

After 24.0 days, 2.00 milligrams of an original 128.0 milligram sample remain. What is the half-life of the sample?

Tags

NGSS.HS-PS1-8

5.

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1 min • 1 pt

Fermium-253 has a half-life of 0.334 seconds. A radioactive sample is considered to be completely decayed after 10 half-lives. How much time will elapse for this sample to be considered gone?

Tags

NGSS.HS-PS1-8

6.

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1 min • 1 pt

At time zero, there are 10.0 grams of W-187. If the half-life is 24 hours, how much will be present at the end of one day? Two days? Seven days?

7.

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1 min • 1 pt

100.0 grams of an isotope with a half-life of 36.0 hours is present at time zero. How much time will have elapsed when 6.25 grams remains?

Tags

NGSS.HS-PS1-8

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