Marie and Pierre lCurie managed to extract 1 mg crl radium from ten tonnes of uranium cure in 1393. The number of atoms in 1 mg of radium is 2.55: x 10'\". Calculate: 1a] The decayI constant for radium226 1b} The activity of a 1mg sample at radium226 1c} The number cnc radium atoms from that sample remaining in 21323 {125 years later}