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Half-Life

Authored by Lisa Thompson

Science

9th Grade

NGSS covered

Half-Life
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25 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

After the third half-life, how much of the sample is left?

1/2

1/3

1/16

1/8

Tags

NGSS.HS-PS1-8

2.

MULTIPLE CHOICE QUESTION

1 min • 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?

3.0g

0.25mg

0.3g

0.25g

Tags

NGSS.HS-PS1-8

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

You have 100 grams of radioactive C-14. The half life of C-14 is 5730 years. 
How many grams are left after 1 half life? 

100 grams

25 grams

2 grams

50 grams

Tags

NGSS.HS-PS1-8

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

Which type of nuclear radiation is being emitted here?

Alpha

beta

gamma

none

Tags

NGSS.HS-PS1-8

5.

MATCH QUESTION

1 min • 1 pt

You have 100 grams of radioactive C-14. The half life of C-14 is 5715 years. 
How many grams are left after each half life? 

6.25g or 1/16

3 half lives

12.5g or 1/8

1 half life

25g or 1/4

2 half lives

50g or 1/2

4 half lives

Tags

NGSS.HS-PS1-8

6.

MATH RESPONSE QUESTION

1 min • 1 pt

An isotope of cesium 138 has a half-life of 30 years. If 1.00 g of cesium-138 disintegrates over a period of 90 years, how many grams of cesium-138 would remain?

Mathematical Equivalence

ON

Tags

NGSS.HS-PS1-8

7.

MATCH QUESTION

1 min • 1 pt

Ge-81 emits beta particles and has a half-life of 7.6 seconds.

Determine the time required for a 16.00-gram sample of Ge-81 to decay until only 1.00 gram of the sample remains unchanged.

1/8 radioactive

2 grams

1/16 radioactive

16 grams

1/2 radioactive

1 grams

1/4 radioactive

4 grams

Completely radioactive

8 grams

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