Major technical obstacle(s) to the achievement of a controlled fusion reaction is (are)
I. attaining a temperature of at least 1.0 ´ 108 K
II. containment of the plasma long enough to generate a net output of energy
III. recovering the energy in some useable form

Question

Quizplus · Accepted Answer

All three options presented in the question are major technical obstacles to achieving controlled fusion reaction. The high temperature of at least 1.0 ´ 108 K is necessary to initiate and sustain the fusion reactions, but it is difficult to achieve and maintain without significant energy input. Secondly, containing the plasma for long enough to generate a net output of energy is challenging as the plasma is unstable and tends to escape the container. Finally, recovering the energy in a usable form is also challenging as most of the energy produced in fusion reactions is in the form of high-energy neutrons, which are difficult to capture and convert into useful energy. Therefore, the correct choice is D, all three options are major technical obstacles to the achievement of a controlled fusion reaction.

Major Technical Obstacle(s) to the Achievement of a Controlled Fusion