Question #929cd

1 Answer
Chirag Mehta
Dec 10, 2017

#0.5kg#

Explanation:

Given mass is #4kg # of uranium
In #4.5 # billion years mass left would be half that is #2kg #.
in next #4.5 #billion years again half will decay that is #1kg #.
left mass is #1kg# .
in next and final #4.5# billion years again half would be decyed left mass would be #0.5kg#

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