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

When a pendulum is held high and taut and then is released, the pendulum begins to swing. what’s the correct order of the energy transformations in this example? (pe stands for potential energy.)