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If the half- life of a sample of a radioactive substance is 30 seconds, how much would be left after 60 seconds ?
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If the half- life of a sample of a radioactive substance is 30 seconds, how much would be left after 60 seconds ?

User JackPearse
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after 30 seconds half is left.  After 30 more seconds, half of that much will be left (25%) or 1/4 of the original amount
User Seko
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