A radioactive sample is observed for 160 days. After 160 days the amount of the sample is found to be 28% of the initial amount. Estimate the half-life of the given sample.
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- the decay of a radioactive material has a count rate is 2000 decays/min. 4 hours later, the decay rate is 500 counts/min. what is the half-life?20.0 hours after being ingested 74.5 % of the original radioactive atoms have decayed or been eliminated. If the biological half-life is known to be 35.0 hours, what is the physical half-life of this isotope? State the time in hours to 1 decimal places but do NOT include units in your answer. Your Answer:The half-life of beryllium-7 is about 53.3 days. (a) Determine the decay constant for beryllium-7. (b) What percentage of a sample remains undecayed after two weeks (1.21 ✕ 106 s)?
- A radioactive sample has a decay constant of 49.15x10-12 s¹. Estimate the half-life.It is known that the initial number of atoms in a radioactive sample is No = 4.0 x 108 atoms. If the the half life of the sample is measured to be 6 days, what is the initial activity R0 of the sample? units in BqAfter 1.80 days, the activity of a sample of an unknown type radioactive material has decreased to 80.4% of the initial activity. What is the half-life of this material?
- A radioactive sample is studied for 100 days. It was found that after the given period the radioactive sample reduced to 83 % of the initial amount. From the given data estimate the half-life of the sample.A sample of radioactive material has a half-life of 12 hours. If the initial sample contained 6.2x10¹3 radioactive nuclides estimate the number of radioactive nuclides present in the sample after 5 hours.The half-life of radon-222 is about 3.823 days. (a) Determine the decay constant for radon-222. 2.1x10-65-¹ ✓ (b) What percentage of a sample remains undecayed after two weeks (1.21 x 106 s)? %
- Does the number of radioactive nuclei in a sample decrease to exactly half its original value in one half-life? Explain in terms of the statistical nature of radioactive decay.(a) At an initial time, a radioactive sample has an activity of 8.52x104 Bq. After 3.85 hours the activity is 5.42×104 Bq. (A) What is the half-life of the isotope? (B) What is the activity after an additional 3.85 hours? (A) (in s) OA: 2.285x103 (B) (in Bq) OA: 1.149x104 OB: 3.314x103 OB: 1.344x104 OC: 4.805x103 OC: 1.573x104 OD: 6.967x103 OD: 1.840x104 OE: 1.010x104 OE: 2.153x104 OF: 1.465x104 OG: 2.124x104 OF: OG: 2.519x104 2.947x104 OH: 3.080x104 OH: 3.448x10411. Radium-226, 226Ra, undergoes an alpha decay. The current sample of Radium-226 has an initial activity of 5.50 × 101º Bq. (a) Identify the daughter nucleus by name, nucleon number, atomic number and neutron number. (b) What is the decay constant? (c) How many radioactive nuclei were initially present in the sample? (d) How long will it take the sample to reach an activity of 5.00 x 1010 Bq?