$10\, gm$ of radioactive material of half-life $15$ year is kept in store for $20$ years. The disintegrated material is ............$gm$
$10\, gm$ of radioactive material of half-life $15$ year is kept in store for $20$ years. The disintegrated material is ............$gm$
- A
$12.5 $
- B
$10.5$
- C
$6.04$
- D
$4.03 $
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