Asample of a substance has a mass of 78.9 g and a volume of 84.3 cm3 what is the density?

What are the 4 phases of matter in order of increasing engery content?

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.

What best discribes the relationship between wavelength and frequency in a electromagnetic wave