Thorium-234 is a radioactive element that has a decay constant of 3.33 × 10-7 s-¹. It decays by beta-decay with an energy of 270 keV. A sample of pure Th-234 has an initial activity of 8.56 × 10¹3 Bq. i) Calculate the initial number of atoms present. ii) Calculate number of days taken for the activity to drop to one-sixteenth of the initial activity. iii) Calculate the initial mass of the sample, and estimate the reduction in mass at the time calculated in (ii).
Thorium-234 is a radioactive element that has a decay constant of 3.33 × 10-7 s-¹. It decays by beta-decay with an energy of 270 keV. A sample of pure Th-234 has an initial activity of 8.56 × 10¹3 Bq. i) Calculate the initial number of atoms present. ii) Calculate number of days taken for the activity to drop to one-sixteenth of the initial activity. iii) Calculate the initial mass of the sample, and estimate the reduction in mass at the time calculated in (ii).
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Transcribed Image Text:-¹. It decays
is a radioactive element that has a decay constant of 3.33 × 10-7
Thorium-234
by beta-decay with an energy of 270 keV. A sample of pure Th-234 has an initial activity of
8.56 × 10¹3 Bq.
i) Calculate the initial number of atoms present.
ii) Calculate number of days taken for the activity to drop to one-sixteenth of the initial
activity.
iii) Calculate the initial mass of the sample, and estimate the reduction in mass at the
time calculated in (ii).
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