Rajah menunjukkan graf keaktifan melawan masa bagi suatu proses reputan radioaktif.
What is the activity after 2 hours?
Berapakah keaktifan selepas 2 jam?
A 90 counts per minutes
90 bilangan per minit
B 120 counts per minutes
120 bilangan per minit
C 150 counts per minutes
150 bilangan per minit
D 1200 counts per minutes
1200 bilangan per minit
Answer : C
T ½ = 30 minutes
