15) Compute the mass of a nucleus which has a radius of 5 cm.
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A: Number of neutron = mass number -number of proton
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A: To find : density of nucleus
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- 4. What is the energy released/absorbed in this nuclear reaction 4N+H3C + He? (The atomic mass of 14 N is 14.003074 u, and that of 1³C is 13.003355 u) X-3.3e-11 MeV KK RWhat is the activity of a sample of C that contains 6.7x1020 nuclei? The half-life of C is 5700 years. Express your answer using two significant figures. TeAfter 2.14 days, the activity of a sample of an unknown type radioactive material has decreased to 82.2% of the initial activity. What is the half-life of this material? days Need Help? Read It
- Madame Curie filled glass vials with pure radon, produced by her radium, for use in hospitals. Radon has a short half-life of 3.8 days. Suppose that she put 1 MBq of radon in a vial. i) Sketch a graph of the activity of the radon over the next week or two. Label the axes with appropriate numbers and units. Mark on the graph the half-life and the characteristic time. ii) Radon decays through a chain of four very short-lived radionuclides (halflives of 20 minutes and less) before reaching a relatively stable isotope of lead. Approximately what activity will the vial have two or three hours after filling, and about two weeks after filling?The curve to the right shows the radioactive decay of a particular sample of a nucleus called Element 9. A particular nucleus survives for the first 10 hours, what is the probability that particular nucleus of Element 9 will decay between 10 hours and 20 hours? N 400 - a. 50.0%. b. 75.0%. 100- c. 25.0%. d. above 98%. 5 10 15 t (in hrs) e. 86.5%.2) Calculate the density of the nucleus if it had a radius of 10 cm.
- help please11. 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?