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The half life of radioactive isotope is ...

The half life of radioactive isotope is 3 hour. If the initial mass of isotope were 256 g, the mass of it remaining undecayed after 18 hr is a)12 g b)16 g c)4 g d)8 g

A

4 g

B

8 g

C

12 g

D

16 g

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The correct Answer is:
a
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