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2021 BGCSE Physics Paper-1 Question-27
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Q-50
All radioactive sources have a half-life. Which statement about the half-life of a source is correct?
It is half the time for the radioactive source to become safe.
It is half the time it takes for an atom to decay.
It is half the time it takes for the count rate on the detector near the source to decrease to zero.
It is the time it takes for the count rate on the detector near the source to decrease by half.
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