Question

If 75% of the radioactive reaction is completed in 2 hrs, what would be the half-life period?

• A. 1 hr
• B. 1.5 hrs
• C. 2 hrs
• D. 3 hrs

Answer 1

Answer: (A)

1 hr

Answer 2

Remaining value = 25%

N = ̃ 25 = ̃ $\frac { 25 } { 100 }$ =

n = 2, $\frac { \mathrm { t } } { \mathrm { T } }$ = 2 ̃ $\frac { 2 } { \mathrm {~T} }$ = 2 ̃ T = 1hr