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JEEMAIN and NEET
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JEEMAIN PAST PAPERS
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2003
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Q)
The half-life of a radioactive isotope is 3 h. If the initial mass of the isotope were 256 g, the mass of it remaining undecayed after 18 h would be :
( A ) 8.0 g
( B ) 12.0 g
( C ) 4.0 g
( D ) 16.0 g
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