The decay constant of radium is 4.28 × 10⁻⁴ per year. Its half life will be(a) 2000 years(b) 1240 years(c) 63 years(d) 1620 years
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Option A is Correct
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The decay constant and the half time of the radioactive materials are mathematically related with each other.
The mathematical relationship between then is:
Half time=0.693/decay constant
[According to the data mentioned in the question]
Half time=0.693/4.28 × 10⁻⁴
Half time = 1619.158
Half time= 1620 [approximately]
That's why the correct answer of this question is option d,1620 years.
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