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Agata [3.3K]
3 years ago
9

A sample of radium has a weight of 1.5 mg and decays

Mathematics
1 answer:
Oliga [24]3 years ago
6 0

Answer: (b)

Step-by-step explanation:

Given

Initial mass of radium is A_o=1.5\ mg

It decays by half every 6 years i.e. T_{\frac{1}{2}}=6

For radioactive decay, sample at any time is given by

\Rightarrow A=A_o2^{-\dfrac{t}{T_{\frac{1}{2}}}}

Insert the values

\Rightarrow A=1.5\cdot 2^{\dfrac{-t}{6}}\\\\\Rightarrow A=1.5\cdot \left(\dfrac{1}{2}\right)^{\dfrac{-t}{6}}\\\\\Rightarrow A=1.5\cdot (0.5)^{\dfrac{t}{6}}

Thus, option  (b) is correct.

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