1.

The half-life of ._(92)U^(238) " is " 4.5 xx 10^(9) years. After how many years, the amount of ._(92)U^(238) will be reduced to half of its present amount

Answer»

`9.0 XX 10^(9)` years
`13.5 xx 10^(9)` years
`.45 xx 10^(9)`years
`4.5 xx 10^(4.5)` years

Solution :Because `t_(1//2) = 4.5 xx 10^(9)` years, so after `4.5xx10^(9)` years the amount of `._(92)U^(238)` will be half decayed


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