What happens when you open a switch?
a. an electric circuit is closed
b. the resistance in the wire is reduced
c. current cannot flow
d. there is a short circuit

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

How do you know how many valence electrons an atom has?