Doubling period and half-life problems Quiz Welcome to your Doubling period and half-life problems Quiz Please click "Next" Solve the problem The world population is doubling approximately every 35 years. In 2021 the world population is approximately 8 billion people. If the population continues to grow at the same rate, what will be the population in 2050? Round your final answer to the nearest billion billion people Solve the problem A bacteria culture starts with 3000 bacteria. After 3 hours there are 48000 of bacteria. How long does it take for the amount of bacteria to double? minutes Solve the problem Radium-221 has a half-life of 30 seconds. How much of it would remain after 2 minutes (in %)? % of the original amount would remain Solve the problem Stronium-90 has a half life of 25 years. How long would it take 6 mg of it to decay to 1 mg? Round your final answer to the nearest tenths of a year. years Hint Solve the problem The doubling period of a bacteria culture is 15 minutes. The sample contains 4000 bacteria. How many bacteria will there be after 1 hour? bacteria Time is Up! Time's up