Question
The power output of the Sun is $4\times 10^{26}\textrm{ W}$. (a) If 90% of this is supplied by the proton-proton cycle, how many protons are consumed per second? (b) How many neutrinos per second should there be per square meter at the Earth from this process? This huge number is indicative of how rarely a neutrino interacts, since large detectors observe very few per day.
1. $3\times 10^{38} \textrm{ protons/s}$
2. $6\times 10^{14}\textrm{ neutrinos / s / m}^2$
Solution Video