Amicroscopic magnetic region composed of a group of atoms whose magnetic fields are aligned in a common direction is called a(n in most materials, when these groups are randomly distributed, the substance will show magnetism.

Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.

Abar magnet cut in half will form a total ofpoles.a)fourb)eightc)two

Which are true about beta reactions? there will be more than one answer. a. it has no change b. it doesn't change the mass of the number c. it has a mass of 0.0005 atoms d. it causes transmutation.