NEET 2022
- Exam
- NEET
- Year
- 2022
- Subject
- Physics
- Chapter
- Nuclear Physics
NEET 2022 · Physics · Nuclear Physics
Given below are two statements: Statement I: The law of radioactive...
Given below are two statements:
Statement I:
The law of radioactive decay states that the number of nuclei undergoing the decay per unit time is inversely proportional to the total number of nuclei in the sample.
Statement II:
The half life of a radionuclide is the sum of the life time of all nuclei, divided by the initial concentration of the nuclei at time .
In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- ABoth Statement I and Statement II are correct
- BBoth Statement I and Statement II are incorrect
- CStatement I is correct but Statement II is incorrect
- DStatement I is incorrect but Statement II is correct
Correct answer
B. Both Statement I and Statement II are incorrect
Step-by-step solution
Both statements are incorrect.
As per law of disintegration, we have,
(where, the symbols have their usual meanings) Hence, , so the statement is incorrect. is the time in which active number of nuclei becomes half, so the statement II is also incorrect.