Question
Question: A G.M. counter is used to study the radioactive process of first-order. In the absence of radioactiv...
A G.M. counter is used to study the radioactive process of first-order. In the absence of radioactive substance A, it counts 3 disintegration per second (dps). When A is placed in the G.M. counter, it records 23 dps at the start and 13 dps after 10 minutes. It records x dps after next 10 minutes and A has half-life period y minutes. x and y are :
A
8 dps, 10 min
B
5 dps, 10 min
C
5 dps, 20 min
D
5 dps, 5 min
Answer
8 dps, 10 min
Explanation
Solution
There is an error of 3 dps
\ C0 = 20 dps
Ct = 10 dps
Thus, half – life = 10 minutes
In next 10 minutes Ct = 5 dps
\ recorded value with error = 8 dps