1.

The half life of radioactive isotope is 3 hour. If the initial mass of isotope were 256 g, the mass of it remaining undecayed after 18 hr isA. 12 gB. 16 gC. 4 gD. 8 g

Answer» Correct Answer - c
`N""_("left")=(N""_(0))/(2""_(n))=256/2""^(6)=4g(T=t""_(1//2)xxn)`


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