AST201H1 Lecture Notes - Lecture 9: Neutrino, Nuclear Reaction, Electric Light

• School: UTSG
• Department: Astronomy & Astrophysics
• Course: AST201H1
• Professor: Bryan Gaensler

Document Summary

As we know, mass can be converted into energy and vice versa. For the sun, it constantly takes four protons at a ime to cause this nuclear reacion. From these nuclear reacions, the mass before is a bit more than the mass ater, the missing mass turns into energy. From four protons, we get 2 neutrons and 2 protons (a helium nucleus) Unlike all the other paricles released in the reacion, they have no electric charge: they aren"t concerned with electromagneism. A neutrino, however, doesn"t even recognize the sun (as it doesn"t recognize. Interesingly, they"re very similar to dark mater, but they are not dark mater atoms), only feeling its gravity, and escapiong immediately. Luminosity: the amount of energy light an object emits per unit ime: for example, a lightbulb would have a luminosity of 100 wats, but we can"t use wats for the sun, the number would be too large.