When an atom of the unstable isotope na-24 decays, it becomes an atom of mg-24 because the na-24 atom spontaneously releases:
(1) an alpha particle
(2) a beta particle
(3) a neutron
(4) a positron

Adeuteron, 21h, is the nucleus of a hydrogen isotope and consists of one proton and one neutron. the plasma of deuterons in a nuclear fusion reactor must be heated to about 3.02×108 k . what is the rms speed of the deuterons? express your answer using two significant figures.