Announcements Sample exam, review & study suggestion are in the Study-Aids section of web site. Some may want to re-read the letter on learning styles in the Study-Aids section. To join clicker to class today: – Turn on the Clicker (the red LED comes on). – Push “Join” button followed by “20” followed by the “Send” button (switches to flashing green LED if successful). ● You must be signed up for e- mail discussion list by Friday. ● On average class did very well on Quiz (~80%). ● Strict time limit on the quiz next Monday.

Review Defined Temperature as average kinetic energy of particles in the sample. (conversion among o F, o C and K). Measuring background glow to verify that Big Bang was not uniform.  max =(2.897 x 10 6 nm)/T Fusion in stars producing elements larger than H and He. –H fusion to get He in stars like our sun. –Multiple fusions in larger stars. Ends at Fe

Binding Energy per Nucleon Deuterium ( 2 1 d) = n + p –total mass = M d = x g –M n = x g –M p = x g Mass lost = M n + M p - M d = x g Total binding energy = E= mc 2 = x g(1 kg/1000 g)(2.998 x 10 8 ms -1 ) 2 = 3.46 x J. Have 2 nucleons, so per nucleon we have : 3.46 x J/2 =1.73 x J/nucleon If mass is in amu use conversion 1 amu = x g. Masses of atoms in amu contain mass of e-, subtract to get mass of nucleus. (ie. Subtract m e- # e- )