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3:58 PM Thu 28 Apr то (b) Bananas are rich in potassium and contain the naturally occurring potassium-40 radioisotope. P
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3:58 PM Thu 28 Apr то (b) Bananas are rich in potassium and contain the naturally occurring potassium-40 radioisotope. P
3:58 PM Thu 28 Apr то (b) Bananas are rich in potassium and contain the naturally occurring potassium-40 radioisotope. Potassium-40 is a significant source of radioactivity in the human body and the activity of a human body due to potassium-40 is approximately 5400 Bq. Potassium-40 has a half-life of 1.25 x 10 years and it is a beta-emitter. (i) Write the decay equation, including the atomic number and mass for each element when potassium-40 undergoes a beta emission. (3 marks) (ii) Calculate the number of potassium-40 nuclei in a person with an activity of 5400Bq. (6 marks) (c) What causes an element to undergo radioactive decay? (3 marks) 50% > >
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