1.

Half-life of a radioactive substance is 120 days. After 480 days, 4 g will be reduced to

Answer»

2
1
0.5
0.25

Solution :`n = (480)/(120) = 4,N = (N_(0))/(2^(n)), N = (4)/(2^(4)) = (4)/(16) = 0.25 g`


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