If the radioactive decay constant of radium is 1.07×10−4 per year, then its half life period is approx. equal to

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8,900 years

7,000 years

6,476 years

2,520 years

answer is C.

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Detailed Solution

T=0.693λ=0.6931.07×10−4 =0.6476×104 years = 6476 years

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