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Gay Lussac's Law, Avagadro's Law

Half life of ...

Question

Half life of radium is $1580$ years. It remains $1 / 16$ after the ________.

A

1580

yrs

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B

3160

yrs

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C

4740

yrs

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D

6320

yrs

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Solution

The correct option is D $6320$ yrs
Half life=1580 years
Sample remains $\frac{1}{16}$ after 4 half-lives i.e $4 \times 1580 = 6320 y e a r s$

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