Correct!
Wrong!
The half-life of a radioactive isotope is three hrs. If the initial mass of the isotope were 256 g, the mass of it remaining undecayed after 18 hrs would be 4.0 g.
The half-life of a radioactive isotope is three hrs. If the initial mass of the isotope were 256 g, the mass of it remaining undecayed after 18 hrs would be
