The minimum amount of unstable atoms needed to produce an uncontrolled chain reaction is called
atomic mass
critical mass
mass number

Which term best describes the phrase “something that happens”?

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?

Define the terms moral development and moral reasoning.