Choose the true statement concerning the mass of subatomic particles. a.electrons are more massive than protons. b.electrons are more massive than neutrons. c.protons and neutrons have about the same mass. d.all subatomic particles have about the same mass.

The atoms in a nickel crystal vibrate as harmonic oscillators with an angular frequency of 2.3 × 1013 rad/s. the mass of a nickel atom is 9.75 × 10-26 kg. what is the difference in energy between adjacent vibrational energy levels of nickel? (h = 6.626 × 10-34 j • s, , 1 ev = 1.60 × 10-19 j)