The protonproton cycle consumes four protons while producing 27 MeV of energy. (a) At what rate must
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The proton–proton cycle consumes four protons while producing 27 MeV of energy.
(a) At what rate must the Sun consume protons to produce its power output of 4x1026 W?
(b) The present phase of the Sun’s life will end when it has consumed about 10% of its original protons. Estimate how long this phase will last, assuming the Sun’s 2x1030 kg mass was initially 71% hydrogen.
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