Question

1. a certain isotope has a half life of 24.3 minutes. what is the decay constant (in s^-1) of this isotope?

2. You are told that a room contains an isotope with a half-life of 1.5 hours. If you need to wait until the isotope has decayed to 15% of its initial activity before entering the room, how long (in hours) must you wait

Answer 1

Sol o tyz = 24.3 min z 24.3 X 60s dir c14585 As we know the relation of half-life 7112 ton = 0.623 d 0.693 0.693 A112 1458 Hence, Decay = 4.753x104 S- Constant