Atoms and nuclear radiation

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Question 9
Easy

The graph shows how the activity of a sample of Caesium-137 varies with time.

A line graph showing the radioactive decay of a sample of Caesium-137. The vertical axis is labeled 'Activity in Bq' and ranges from 0 to 800 Bq with major gridlines every 100 Bq. The horizontal axis is labeled 'Time in years' and ranges from 0 to 90 years with major gridlines every 10 years. The decay curve begins at an initial activity of 800 Bq at 0 years, passes through 400 Bq at exactly 30 years, and 200 Bq at 60 years.

a.

How much time will it take for the activity of the sample of Caesium-137 to fall to half of its initial activity?

[2]
b.

What is the half-life of Caesium-137?

[2]

Atoms and nuclear radiation Questions

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