1. The problem statement, all variables and given/known data 1x10^6 sodium atoms are excited to the 3p state at t=0s. The lifetime of the 3p state is 17ns. a.how many of these atoms remain in the 3p state at t=10ns? b.how many photons have been emitted from t=0s to t=30ns? 2. Relevant equations N=Noe^(-t/[tex]\tau[/tex]) 3. The attempt at a solution a. N=1x10^6*e^(-10ns/17ns)=5.55x10^5 sodium atoms b. N=1x10^6*e^(-30ns/17ns)=171237 sodium atoms thus N-No=828763 sodium atoms undergo quantum jump during the first 30ns, each of these atoms emits a photon, thus 828763 photons are emitted. Im not sure if these are correct, but cant find where ive gone wrong, is it ok to do it like that and that the fact that the 17ns lifetime... doesnt have any effect on the 30ns... plz can someone confirm that im right or help me where i have gone wrong thanks.