(2) What is the mass defect of a He atom if the atomic mass is 4.002603 amu? Answer: ---- mass defect = Am = 0.030377 amu (3) What mass of fuel must be consumed in a nuclear reactor to produce 36 x 10¹6 Joules? (4) If 5 kg of fuel is consumed in a nuclear reactor how much energy is released?
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- 10. The radioactive isotope (82Sr) has a half-life of 25.4 days. A sample containing this isotope has an initial activity at (t = 0) of 4.50 × 108 Bq. Calculate the number of nuclei that will decay in the time interval between t₁ = 80.0 hours. for ssi nuclei ssf624 50 ssfo 30.0 hours and t2 sf60 s 60 ssf6AaBbCcDd AaBbCcD. AaBbC AaBbCcC AaBbCcC AaBbCeD AaBbCcD AaB AaB 1 Caption Emphasis Heading 1 1 List Para. 1 Normal Strong Subtitle Title 1 No Paragraph 24. A radioactive element X decay to a radioactive element Y which then decay to an element Z. If initially there is only X, which of the following influences the ratio of the number of nuclides of Y to that of X? A. Type of Z C. The initial total of Y B. Half-life of Y D. Surrounding pressure 25. A metal rod of length L which is placed on two parallel conductors in a magnetic field B which is directed perpendicularly into the paper is shown in the diagram. B 7. Applied lish (United States) rch 30°C Light rain4. 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
- Radon gas has a half-life of 3.83 days. If 2.92 g of radon gas is present at time t = 0, what mass of radon will remain after 2.20 days have passed? gHalf of the mass of a piece of wood just cut from a tree consists of carbon. The piece of wood emits 8325 electrons per minute and among the elements that compose it only one is radioactive. Assuming that in a tree the isotopic abundance of ¹4C is 1.3 × 10-¹2, estimate the weight of the piece of wood in grams to 1dp2. 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
- 6. In nature, in a stable state hydrogen has two kinds of isotopes, namely 99.985% 1H with an atomic mass of 1.00783 sma and 0.015% 2H with an atomic mass of 2.01410 sma. The average atomic mass of hydrogen is .... (in sma) a. 1.00150 b. 1.00324 c. 1.00798 d. 1.01528 e. 1.07960 Note : all H have the number 1 below 1H个 个 50 Write the complete nuclear equation for atoms undergoing electron capture. 901 Ag + 116. Sn + 78 123 533:01 1 4 7 +/- Question 7 of 12 The half-life of element X is 500 years. If there are initially 8 g of X, how much will remain after 1500 years? 2 5 8 3 60 9 O g Submit Tap here or pull up for additional resources XU x 100
- In a real or imaginary nucleus of 45X⁹7, (a) how many protons are in the nucleus, (b) how many neutrons are in the nucleus, and (c) how many electrons are in orbit about the nucleus, assuming the atom is electrically neutral? (a) Number (b) Number i (c) Number Units Units Units4. 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 RThe nuclear radius of a fictitious element is 3.145 fm. The number of protons and the number of neutrons in this nucleus are (select all that apply): 09 and 9 O8 and 10 O9 and 8 O8 and 8 9 and 10 O 10 and 8 O8 and 9 O 10 and 9