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Question

The conclusion that may be drawn from the experiment which demonstrated radioactivity (A.R) is

A
Al is artificial radioactive substance
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B
positrons are essential for the production of A.R.
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C
Exponential decay led to the discovery of A.R.
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D
In A.R., only positrons are produced
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Solution

The correct option is C Exponential decay led to the discovery of A.R.
The rate of decay was proportional to current number of active atoms which implied the exponential decay and led to the discovery of A.R.

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