A G.M. counter is used to study the radioactive process of …

Chemistry Nuclear Chemistry General Single Correct MCQ

Published on: August 14, 2026

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 :

8 dps, 10 min

5 dps, 10 min

5 dps, 20 min

5 dps, 5 min

Text Solution

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The correct answer is:

There is an error of 3 dps

∴ C 0 = 20 dps

C t = 10 dps

Thus, half – life = 10 minutes

In next 10 minutes C t = 5 dps

∴ recorded value with error = 8 dps

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