Which of these is the best definition for disintegration? a. when rock becomes moist b. when rock is physically broken into smaller pieces c. when rock is chemically broken into smaller pieces d. when rock undergoes a rather large chemical change

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.