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MediumQ. No. what-is-the-half-life-of-a-radioactive-substance

What is the half-life of a radioactive substance?

Last Updated: 25 Jun 2026

ATime for complete decay

BTime for half the atoms to decay

CTime for double the activity

DTime constant of decay

Correct Answer: Time for half the atoms to decayYour Answer: B

Explanation

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

Important Notes

T½ = 0.693/λ

SSC CGL Physics

SSC CGL

Answer

Time for half the atoms...

Exam Info

Asked in: SSC, Railway, Banking and other competitive exams.
Also asked in: RRB NTPC, CHSL, State PCS and online mock tests.
Topic: SSC CGL Physics

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