. Half life for certain radioactive element is 5 min. Four nuclei of that element are observed at a certain instant of time. After five minutes Asserti


Half life for certain radioactive element is 5 min. Four nuclei of that element are observed at a certain instant of time. After five minutes
Assertion (A): It can be definitely said that two nuclei will be left undecayed.
Reasoning (R): After half life i.e. 5 minutes, half of total nuclei will disintegrate. So only two nuclei will be left undecayed. Then

  • (A):A is correct & R is correct explanation of A.
  • (B):Both are correct. But R is not correct explanation of A.
  • (C):A is incorrect & R is correct.
  • (D):Both are incorrect.

Best Answer

Correct Answer:

(D): Both are incorrect.

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