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sample of radioactive phosphoru? How long will it take for a sample of radioactive phosphorus-32 to decay to 5.00 percent of its original activity ? The half-life of phosphorus-32 is 14.30 days, so give your answer in days.

...the piece of wood in years ? A chemists determines that a sample of petrified wood has a carbon-14 decay rate of 7.43 counts per minute per gram. What is the age of the piece of wood in years ? The decay rate of carbon-14 in fresh wood today is 13.6 counts per minute per gram, and the half...

...5.00 percent of its original activ? How long will it take for a sample of radioactive phosphorus-32 to decay to 5.00 percent of its original activity ? The half-life of phosphorus-32 is 14.30 days, so give your answer in days.