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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
No. of half lives, `n=(18)/(3)=6`
`N_(0)=256 g`
`N=(N_(0))/(2^(n))=(256)/(2^(6))g`
`(256)/(64) = 4 g`
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