Why does the proton-proton chain need high temperatures?
A)High temperatures increase the ground state energy of the hydrogen atom.
B)High temperatures increase the velocity of the protons so they can overcome the Coulomb barrier.
C)High temperatures lower the density of the gas.
D)High temperatures allow the neutrinos to carry more energy away than the reaction produces.

Question

Quizplus · Accepted Answer

The proton-proton chain involves the fusion of protons to form helium nuclei. However, the positively charged protons repel each other due to the Coulomb force. This barrier can only be overcome if the protons have sufficient velocity (kinetic energy). High temperatures increase the thermal energy of the gas, which translates to higher velocities of the particles, including the protons. This allows them to overcome the Coulomb barrier and initiate the fusion process.

Why Does the Proton-Proton Chain Need High Temperatures