The half life period of a radioactive substance is 140 days. After how much time, 15 g will decay from a 16 g sample of the substance?

Question

MARKS Content Team · Accepted Answer

Correct answer: (B) 560 days. Ratio of mass remaining undecayed to initial mass is, m/m_0=1^2tT (16-15)/16=1^2tT 1^24=1^2tT ⇒ t=4T=4×140 days t=560 days

The half life period of a radioactive substance is $140$ days. After how much time, $15 g$ will decay from a $16 g$ sample of the substance?

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