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Question-1 

A sample of radioactive elements contains 4 x 1010 active nuclei.  If half-life of element is 10 days.Calculate  the number of decayed nuclei after 30 days ?

 


(A)

0.5 × 1010


(B)

2 × 1010

(C)

3.5 × 1010

(D)

1 × 1010





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