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Which outcome occurs when plasma temperature falls below fusion reaction's activation energy in a tokamak reactor?

A)Fusion reaction rate exponentially decreases
B)Plasma confinement time linearly decreases
C)Magnetic field strength proportionally decreases
D)Neutron flux remains constant temporarily

💡 Explanation

When plasma temperature drops below the activation energy, the tunneling probability through the Coulomb barrier falls exponentially because fewer particles possess sufficient kinetic energy to overcome electrostatic repulsion. Therefore, the fusion rate decreases exponentially, rather than linearly affecting confinement, magnetic field linearly or constant neutron flux which depend on steady reaction rate.

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