Certain radio-active substance reduces to \( 25 \% \) of its value in 16 days. Its half-life is
... VIDEO
Certain radio-active substance reduces to \( 25 \% \) of its value in 16 days. Its half-life is
(A) 32 days
(B) 8 days
(C) 64 days
(D) 28 days
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