Question

The half-life of ₉₂U²³⁸ is 4.5 × 10⁹ years. After how many years, the amount of ₉₂U²³⁸ will be reduced to half of its present amount ?

(a) 9.0 x 10⁹ years

(b) 13.5 x 10⁹ years

(c) 4.5 x 10⁹ years

(d) 4.5 x 10^4.5 years

Answer 1

Correct option is (c) 4.5 x 10⁹ years

After one half life period, i.e. 4.5 x 10⁹ years.