The half-life of cadmium-109 is 450 days. A scientist measures out a 200 gram (g) sample. Approximately how many grams of cadmium-109 would remain after 1,350 days?
100 g
O 50 g
O 12.5 g
O 25 g

Suppose while hauling rocks, you accidentally drop one. it breaks apart in flat, planar sections. what type of rock did you just drop? 20 points

How many times did thomas edison mess up the light bulb

A0.750 kg aluminum pan is removed from the stove and plunged into a sink filled with 10.0 kg of water at 293 k. the water temperature quickly rises to 297 k. what was the initial temperature of the aluminum pan? the specific heat of aluminum is ca = 900 j/(kgk) and water is cw = 4190 j/(kgk)