📊 Physics
Q. What is the half-life of a radioactive substance?
  • (A) Time taken to complete the reaction
  • (B) Time in which half of the radioactive nuclei decay
  • (C) Time taken for all atoms to decay
  • (D) Time taken for decay rate to double
✅ Correct Answer: (B) Time in which half of the radioactive nuclei decay

Explanation: Half-life is the time required for half of the radioactive nuclei in a sample to decay.

Explanation by: Tina Singh
Half-life is the time required for half of the radioactive nuclei in a sample to decay.

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