A substance has half of 3 min After 6 min the c... - JAMB Physics 2020 Question
A substance has half of 3 min. After 6 min, the count rate was observed to be 400. What was its count rate at zero time?
A
1600
B
1200
C
200
D
2400
correct option: a
Let N = count rate at zero time
N
= 400
N =
N = 1600
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