Radioactive decay: A certain substance hasa half-life of 5.0 hours. How many nucleiof the substance are required to give aninitial activity of 6.0 µCi? 1 Ci = 3.7 × Bq.O 3.2 x10^9O 5.8 × 10^98.5 × 10^8O 6.3 × 10^8

Recall that the activity of a radioactive substance is defined as follows:A=λNWhere:- A is the…

Answered: Radioactive decay: A certain substance…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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ST 2. Find the total binding energy for Manganese, MeV 55 foon (atomic mass = 54.938047 u). f60 ssf6
What is the binding energy per nucleon of the rutherfordium isotope Rf? Here are some atomic masses and the neutron mass: 259Rf 259.10563 u 104 ¹H n 1.007825 u 1.008665 u
A radioactive isotope with an intensity (activity) of 100 mCi per vial is delivered to a hospital. The vial contains 10 mL of liquid. The instruction is to administer 2.5 mCi intravenously. How many milliliters of the liquid should be administered? Select one: a. 0.66 ml b. 0.18 ml c. 0.40 ml d. 0.25 ml
H6
By considering the general conditions of nucleus stability show that the nucleus 22⁹Th will decay and decide whether the decay will take place by a or ß emission. 90 The atomic mass excesses of the relevant nuclei are: Element He Mass excess amu × 10-6 2,603 229 pa 229 Th 229 AC 91 225 Ra 90 89 88 23,528 32,800 31,652 32,022
Identify the unknown isotope X in the following decays.a. X → 224Ra + α b. X → 207Pb + e- c. 7Be + e- → X d. X → 60Ni + γ
The half-life of 27Mg is 9.50 min. Initially there were 3.70 × 1012 27Mg nuclei present. How many 27Mg nuclei are left 29.0 min later? Please give your answer to 2 significant figures.
2.2
4. An ancient club is found that contains 150 g of pure carbon and has an activity of 4 decays per second. Determine its 14 C age assuming that in living trees the ratio of 5700 years and the Avogadro number is 6.02 × 10²³. (THC) years atoms is about 1.40 × 10-¹2. Note that the half life of carbon-14 is ss160 f60 sst ssf60 sf60 ss
[Review Topics] [References] Radioactive vanadium-48 decays with a half-life of 16.0 days. a. What is the value of k in s12 k = b. A sample contains 58.0 mg 48 t° V. How many decay events will be produced in the first second? Assume the atomic mass of 48 V is 48.0 u. decays/s c. A chemist obtains a fresh sample of 8V and measures its radioactivity. She then determines that to do an experiment, the radioactivity cannot fall below 25% of the initial measured value. How long does she have to do the experiment? days Submit Answer Retry Entire Group 4 more group attempts remaining
Problems:1. Living matter has 1.3 x 10-10 % of its carbon in the form of C-14 which has a half-life of 5730 yr. A mammoth bone has a 300-g sample of carbon separated from it, and the sample is found to have an activity of 20 decays per second. How old is the bone?
2. A neutron causes 223Fr to change according to the following reaction: n +22³Fr →AX+y 87 87 The X nucleus subsequently undergoes - decay, and its daughter does too. What is the atomic mass number of the final nucleus? 60 ssf602 ssf60 ss. 60 ssf60% Ossi ssf60 ss f60 ssf60

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Radioactive decay: A certain substance has a half-life of 5.0 hours. How many nuclei of the substance are required to give an initial activity of 6.0 µCi? 1 Ci = 3.7 × Bq. O 3.2 x10^9 O 5.8 × 10^9 8.5 × 10^8 O 6.3 × 10^8