| Direction: For the following questions choose the correct answers from the codes [a], [b], [c] and [d] defined as follows. |
| Statement I Xenon-139 has a half-life of 41 s, and is produced at a constant rate during the fission of a particular sample of U-235. (Assume that number xenon-139 atom escape d from the sample). Then in this situation, number of nuclei of xenon-139 atom becomes constant after a certain time. |
| Statement II Half-life of U-235 to decay to xenon-139 is very near to 41 s. |
A) Statement I is true. Statement II is also true and Statement II is the correct explanation of Statement I.
B) Statement I is true. Statement n is also true and Statement II is not the correct explanation of Statement I.
C) Statement I is true. Statement II is false.
D) Statement I is false. Statement II is true.
Correct Answer: C
Solution :
When the rate at which xenon-139 nuclei decays is same at that of xenon-139 nuclei becomes constant with time and this can happen even when half-lives of both the decays are not comparable.
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