The protonproton 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 4x10 26 W (b) The present phase of the Suns life will end when it has consumed about 10 of its original protons Estimate how long this phase will last, assuming the Suns 2x10 30 kg mass was initially 71 hydrogen

Question: The protonproton cycle consumes four protons while producing 27 MeV of energy. (a) At what rate must the Sun consume protons to produce its power

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 2x10³⁰kg mass was initially 71% hydrogen.

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