The half-life of f-20 is 11.4 seconds. when there are 200 atoms of f-20 in a sample, a scientist starts a stopwatch. the scientist stops the stopwatch at 34.2 seconds; there are atoms of f-20 remaining.

Which of the following ocean acidification? are the most likely side effects of a ph less than 7.0 in the ocean b. more metal salts altering the ocean chemistry c. dissolution of the shells of marine organisms d. both a & b e. all of the above.

Pegmatites are igneous rocks in which the individual minerals are very large. typically, the minerals are all light-colored quartz, feldspar and muscovite. if you were given a black and white photograph of a pegmatite in a quarry (where the rock has been blasted and broken), what physical properties could you use to identify those three minerals in this hypothetical photo? describe each mineral and the specific diagnostic properties. be specific.

What type of radiation is lead emitting in the following equation? alpha particles beta particles gamma rays