A) 250
B) 400
C) 300
D) 200
Correct Answer: D
Solution :
[d] As we know, |
n = no. of half life |
N - no. of atoms left |
initial no.. of atoms |
By radioactive decay law, |
k - disintegration constant |
(ii) |
From (i) and (ii) we get |
or, |
w = 4, Therefore, in 8 seconds 4 half life had occurred in which counting rate reduces to 100 counts . |
Half life, |
In 6 sec, 3 half life will occur |
counts |
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