Question 5: The ions undergoing fusion in many systems will essentially never occur alone but will be mixed with electrons that in aggregate neutralize the ions' bulk ________ and form a plasma.
Question 6: At present, break-even (self-sustaining) controlled fusion reactions have not been demonstrated in the few ________-type reactors around the world.
Question 7: Only direct conversion of mass into energy, such as that caused by the collision of matter and ________, is more energetic per unit of mass than nuclear fusion.
Question 10: He demonstrated that all such systems will leak energy at a rapid rate due to ________ produced when electrons in the plasma hit other electrons or ions at a cooler temperature and suddenly decelerate.