1.

The half life of a radioisotope is 4 hr. If the initial mass of the isotope was 200 g, the mass remaining after 24 hr undecayed is:

Answer»

3.125 g
2.084 g
1.042 g
4.167 g

Solution :No. of half life periods =6
Mass left `=([A]_(0))/(2^(6))=(200)/(2^(6))`
`=(200)/(64)=3.125g`


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