1.

A Geiger Muller counter is used to study the radioactive process. In the absence of radioactive substances A, it counts 3 disintegration per second (dps). At the start in the presence of A, it records 23 dps, and after 10 m in 13 dps, i. What does it count after 20 m in ?

Answer»

8 dps, 10 min
5 dps, 10 min
5 dps, 20 min
5 dps, 5 min

Solution :In the absence of A, 3 dps is ZERO error, hence
INITIAL count=23- 3 = 20 dps
After 10 min=13-3=10 dps
After 20 min = 5 dps (RECORDED =5+3 = 8 dps)
(50% fall in 10 min, `T_(50)` = 10 min)


Discussion

No Comment Found

Related InterviewSolutions