A Geigger Muller counter is used to study the radioactive process. In – McqOptions

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1.	A Geigger Muller counter is used to study the radioactive process. In the absence of radioactive substance A, it counts 3 disintegration per second (dps). At the start in the presence of A, it records 23 dps; and after 10 min 13 dps, (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
Answer» B. 5 dps, 10 min

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