How do sound waves move in air? a) the wave particles diffract around a barrier. b) the wave particles move in a curvilinear motion. c) the wave particles move via acceleration; that is, they increase speed. eliminate d) the wave particles displace one another, with particles replacing each other.

D, because the air s moving as in longitudinal waves which means a wave vibrating in the direction of propagation, and progation means that the making of more and replacing

An  atom  (ours, not carroll's) consists of a positively charged  nucleus, surrounded by one or more negatively charged particles called  electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6  nm.  *  if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -

The answer is b.the gaseous state is electrically positive, while the plasma state is electrically negative.