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There are 10^10 radioactive nuclei in a given radioactive element, Its half-life time is 1 minute.

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There are 1010 radioactive nuclei in a given radioactive element, Its half-life time is 1 minute. How many nuclei will remain after 30 seconds ?

(√2 = 1.414)

(1) 2 × 1010

(2) 7 × 109

(3) 105

(4) 4 × 1010

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1 Answer

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Correct answer is (2).

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