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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

4.0 g

B

8.0 g

C

12.0 g

D

16.0 g

Text Solution

Verified by Experts

The correct Answer is:
A
`N_t = N_0 (1/2)^n , N_t = 256 (1/2)^(18//3) = 256 (1/2)^(6) = 4 `
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