PHY100H5 Lecture 12: Lecture Unit 12
Document Summary
The universe is expanding: red-shifted light from stars. The universe is flat: the size of the lumps on the cmb map. Dark matter: galaxies rotate too fast, gravitational lensing. Dark energy: the expansion of the universe is speeding up. Cos(cid:373)i(cid:272) i(cid:374)flatio(cid:374): the (cid:862)lu(cid:373)ps(cid:863) of sta(cid:396)s a(cid:374)d gala(cid:454)ies. Quantum physics describes the nature and interaction between radiation and matter at the microscopic nature at (cid:448)e(cid:396)(cid:455) s(cid:373)all s(cid:272)ales, the ne(cid:449)to(cid:374)ia(cid:374) ph(cid:455)si(cid:272)s does(cid:374)"t (cid:449)o(cid:396)k, (cid:271)ut (cid:395)ua(cid:374)tu(cid:373) ph(cid:455)si(cid:272)s a(cid:272)(cid:272)u(cid:396)atel(cid:455) describes the behaviour of such small-scale items. Developed in 1900-1930, but still developed toda(cid:455); still (cid:374)ot (cid:272)lea(cid:396) (cid:449)hat it (cid:373)ea(cid:374)s . Central to high-tech world: electronic devices, material science, medical devices, lasers, superconductors, nuclear power (weapons), etc. Radical undoing of newtonian physics: nature is not a predictable machine. Natu(cid:396)e does(cid:374)"t k(cid:374)o(cid:449) (cid:449)hat"s goi(cid:374)g to do (cid:374)e(cid:454)t (there is uncertainty/randomness in nature)! Nature is deeply interconnected because we all came from a single monumental event (the big bang)!
