1.

The half life of a radioactive isotope is three hours. If the initial mass of the isotope was 300 g, the mass which remained undecayed in 18 hours would be :

Answer»

2.34g
1.17 g
9.36 g
4.68 g

Solution :AMOUNT LEFT after N HALF lives `=(N_(0))/(2^(n))=(300)/(2^(6))`
`=(300)/(64)=4.68g`


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