Consider proton-proton (pp) fusion. (a) Explain what the Coulomb barrier is in relation to pp fusion. (b) The Coulomb ba

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Consider proton-proton (pp) fusion.
(a) Explain what the Coulomb barrier is in relation to pp
fusion.
(b) The Coulomb barrier height for (pp) fusion is VC ≈ 0.2 MeV. To
have successful fusion on earth it is said that we need a
temperature of at least 100 million degrees. How is the fusion
probability determined? What quantum mechanical phenomena play a
crucial role?
(c) The temperature in the interior of the sun is around T = 1.5 ·
107 K.This means that kBT /VC << 1. Why can we have fusion in
the sun at this lower temperature?