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

Options

A. `9.0 xx 10^(9)` years
B. `13.5 xx 10^(9)` years
C. `.45 xx 10^(9)`years
D. `4.5 xx 10^(4.5)` years

Answer

C

Explanation

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