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Questions  >>  JEEMAIN and NEET  >>  NEET PAST PAPERS  >>  2004
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Q)

The half life of radium in about 1600 years. Of 100g of radium existing now, 25g will remain undecayed after :-


( A ) 3200 years
( B ) 6400 years
( C ) 2400 years
( D ) 4800 years

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