Problem 84IE
A 53.8-mg sample of sodium perchlorate contains radioactive chlorine-36 (whose atomic mass is 36.0 amu). If 29.6% of the chlorine atoms in the sample are chlorine-36 and the remainder are naturally occurring nonradioactive chlorine atoms, how many disintegrations per second are produced by this sample? The half-life of chlorine-36 is 3.0 × 105 yr.
ASTRONOMY AST 1002-0001 RILEY WEEKS 1-2 WEEK ONE LECTURE NOTES ASTRONOMY o There are 88 constellations that the sky is divided into o Pinpointing locations/regions in the sky is aided by constellations o ASTRONOMY definition: • Ancient- Study of patterns in the heavens • Now- Study of the universe o UNIVERSE definition: • Totality of Space, time, matter and energy o Keep in mind that Earth is merely average in comparison to the universe o Astronomy DOES NOT = Astrology o Astronomy is the distribution or arrangement of stars whereas astrology is the study of stars MEASURING DISTANCES o Earth is a very small planet in relation to the universe • The moon is the nearest neighbor • Earth or
