Chemical Kinetics Question 339

Question: 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-

Options:

A) 8 dps, 10 min

B) 5 dps, 10 min

C) 5 dps, 20 min

D) 5 dps, 5 min

Show Answer

Answer:

Correct Answer: A

Solution:

[a] In the absence of A, 3 dps is zero error, hence Initial count $ =23-3=20dps $ After $ 10min=13-3=10dps $ After 20 min =5 dps (recorded =5+3=8 dps) (50% fell in 10 min, $ T_{50}=10,min $ )



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