A piece of wood was found to contain 5% of the original carbon-14 content. The half-life of carbon-14 is 5700 years. Calculate the age of the wood, in years. Suggest a reason why carbon-14 is unsuitable for dating samples that are more than 50 000 old. 4. Phosphorus-32 and strontium-89 are two radioisotopes used to study how far mosquitoes travel. (a) Strontium-89 decays by emission of a beta particle. Complete the nuclear equation for the decay of strontium-89. (b) A mosquito fed on a solution containing phosphorus-32 is released. Phosphorus-32 has a half-life of 14 days. When the mosquito is recaptured 28 days what fraction of the phosphorus-32 will remain?
A piece of wood was found to contain 5% of the original carbon-14 content. The half-life of carbon-14 is 5700 years. Calculate the age of the wood, in years. Suggest a reason why carbon-14 is unsuitable for dating samples that are more than 50 000 old. 4. Phosphorus-32 and strontium-89 are two radioisotopes used to study how far mosquitoes travel. (a) Strontium-89 decays by emission of a beta particle. Complete the nuclear equation for the decay of strontium-89. (b) A mosquito fed on a solution containing phosphorus-32 is released. Phosphorus-32 has a half-life of 14 days. When the mosquito is recaptured 28 days what fraction of the phosphorus-32 will remain?
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