ii) The half-life of a radioactive element is 20 days. Calculate the time taken for the number of nuclei to decrease to 40% their initial value.
ii) The half-life of a radioactive element is 20 days. Calculate the time taken for the number of nuclei to decrease to 40% their initial value.
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![ii) The half-life of a radioactive element is 20 days. Calculate the time taken for
the number of nuclei to decrease to 40% their initial value.
iii) Determine the percentage of unstable nuclei remaining after a time / = 3T1/2
has elapsed given that 100% of the nuclei are unstable at time = 0. Hence draw a
fully labelled diagram to show how the activity of a radioactive sample varies with
time.
iv) A radioactive source has an activity of 4.2x107 Bq due to the decay of a
radioisotope with a half-life of 7500 years. Calculate the decay constant and
the number of undecayed nuclei in the source.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F63752fd6-70bb-4ef5-ab70-73135746e64f%2F181c1dc7-2505-4015-8035-f0527baa74ea%2Fosth22d_processed.jpeg&w=3840&q=75)
Transcribed Image Text:ii) The half-life of a radioactive element is 20 days. Calculate the time taken for
the number of nuclei to decrease to 40% their initial value.
iii) Determine the percentage of unstable nuclei remaining after a time / = 3T1/2
has elapsed given that 100% of the nuclei are unstable at time = 0. Hence draw a
fully labelled diagram to show how the activity of a radioactive sample varies with
time.
iv) A radioactive source has an activity of 4.2x107 Bq due to the decay of a
radioisotope with a half-life of 7500 years. Calculate the decay constant and
the number of undecayed nuclei in the source.
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