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Q.

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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a

8,900 years

b

7,000 years

c

6,476 years

d

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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