| (i) What does it count after 20 min |
| (ii) What is the half life of A? |
A) 8 dps, 10 min
B) 5 dps, 10 min
C) 5 dps, 20 min
D) 5 dps, 5 min
Correct Answer: A
Solution :
[a] In the absence of A, 3 dps is zero error, hence Initial count \[=23-3=20\text{ }dps\] After \[10min=13-3=10\text{ }dps\] After 20 min =5 dps (recorded =5+3=8 dps) (50% fell in 10 min,\[{{T}_{50}}=10\,min\])
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