JAMB - Physics (2011 - No. 36)
A radioactive isotope has a decay constant of 10-5s4. Calculate half life
6.93 x 10-5s
6.93 x 105s
6.93 x104s
6.93 x 10-4s
解释
T (1)/2 = (0.693)/λ = (0.693)/10-5
= 0.693 x 105
= 6.93 x 104 sec
= 0.693 x 105
= 6.93 x 104 sec