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Rutherford's Set up and Predictions

A radioactive...

Question

A radioactive sample with a half-life of 1 month has activity 2ci. Its activity 2 months earlier was:

A

1 ci

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B

0.5 ci

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C

4 ci

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D

8 ci

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Solution

The correct option is C 8 ci
$H a l f L i f e = t_{1 / 2} = 1 m o n t h$

$A c t i v i t y = 1 c i$

In two half lives the activity become one fourth.

Activity before $2 m o n t h s$

$- 4 \times 2 = 8 c i$

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