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in Physics by (71.1k points)

10 milligrams of a radioactive material of half life two years are kept in a store for four years. Then the amount of the material remaining unchanged is

(1) ~ 7.5 mg

(2) ~ 2.5 mg 

(3) ~ 0.25 mg 

(4) ~ 0

1 Answer

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Best answer

Correct option : (2) ~ 2.5 mg

Explanation :

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