1.

The half life period of radium is 1580 years. It remains 1.16 after the years

Answer»

1580 years
3160 years
4740 years
6320 years

Solution :We KNOW that `N = N_(0) XX ((1)/(2))^(2)`
Here, `N = (1)/(16), N_(0) = 1`, by putting the VALUES
`(1)/(16) = 1 xx ((1)/(2))^(n) "" :. n = 4`
we know that `T = t_(1//2) xx n`
`:. T 1580 xx 4 = 6320` years


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