Neutron stars are so named because they are composed of neutrons and have a density the same as that of a nucleus. Part A Given that the nuclear density is 2.3 × 1017 kg/m³, find the radius of a neutron star whose mass is 0.58 that of the Sun. Express your answer using two significant figures. ΜΕ ΑΣΦ r = Submit Request Answer Return to Assignment Provide Feedback km
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- Calculate the mass defect (in kg) of 150Nd if it has an observed atomic mass of 149.9208 amu. The mass of a proton and a neutron are 1.0078 and 1.0087 amu, respectively. Express your answers in three decimal places in scientific notation, i.e., 6.022e26 to represent 6.022x1020. No need to include negative sign and units.NUCLEAR CHEMISTRY: Consider the nuclei Sn with an atomic number of 50 and mass number is 117 . Determine its mass defect in kilograms if its atomic mass is 116.956 amu. The mass of a proton and neutron are 1.0073 and 1.0087 amu, respectively. Express your answers in three decimal places in scientific notation, i.e., 6.022e23 to represent 6.022x 105An accident at a nuclear power plant has left the surrounding area polluted with radioactive material that decays naturally. The initial amount of radioactive material present is 42 su (safe units), and 5 months later it is still 31 su. a.) write a formula giving the amount A(t) of radioactive material (in su) remaining after t months. (Use integers or decimals for any numbers in the expression. Round to three decimal places needed.) b.) what amount of radioactive material will remain after 11 months? c.) how long will it be until A = 1 su, so it is safe for people to return to the area?
- Find the number of protons and neutron for Pb-206. Separate your answer by a comma, indicating the number of protons first before the number of neutrons.Gmail Translate A P.1 English 11/SEL.. A Int Math II [Per. 2 ]. A Apex Learning H Over nearly 80 year. - Interim Assessment. * english 1110.docx O New Tab Springboard - Homes A. Does this function represent exponential B. What is vour initial value? C. What is the rate of growth or rate of decay? Review GD &cHalf-1 Prac.docx Open with Half - Life Practice 3.An isotope of Cesium-Un has a half- life of 30 years. If 100 g. of Cesium-Un disintegrates over a period of 120 years, how many grams of Cesium-Un would remain?RADIOACTIVITY. LAW OF RADIOACTIVE DECAY Activity units: 1 Ci = 3.7 × 101º Bq 1. Nuclear decay law: N = Noe¬at, The law of radioactive decay gives the quantitative relationship between the original number of nuclei present at time zero No and the number N at a later time t (sec), where e = 2.71828... is the base of the natural logarithm, and 2 is the decay constant for the nuclide (1/s). 2. Relationship between decay constant 2 and isotop half-life T1/2: In(2) 0.693 Radioisotope Half-life Modality T1/2 T1/2 Carbon-11 20 minutes PET where a is decay constant (1/s), T1/2 is isotope half- life (s). 3. Activity or decay rate of a radioactive source A: ΔΝ Fluorine-18 110 minutes PET Copper-64 12.7 hours PET Gallium-67 78.3 hours SPECT Gallium-68 68 minutes PET = AN Technetum-99m 6.02 hours SPECT Δt where A is activity or decay rate of a radioactive source (Bq), N is number of nuclei present at time t (s ), 1 is decay constant (1/s). 4. Activity A of a radioactive source at a time t:…
- QUESTION 13 The following table of probabilistic time estimates (in weeks) and activity predecessors are provided for a project Immediate Most Probable Predecessor Activity A B C D E F G H Table 1 Reference: Ref 1 A, B B C D, E F Optimistic Time Time 11 13 5 13 6 3 4 6 2 3 10 5 6 8 4 13 Using Table 1, the earliest start time for activity G is OA. 0.0 weeks. OB. 10.0 weeks. O C. 10.5 weeks. O D. 15.5 weeks. O E. None of the above Pessimistic Time 14 19 14 7 11 13 6 9 decessors are pA radioactive substance decays according to the following function, where y, is the initial amount present, and y is the amount present at timet (in days). -0.072 t y=yoe Find the half-life of this substance. Do not round any intermediate computations, and round your answer to the nearest tenth. | daysEstimate the radius of a sphere that would hold all of a person's mass if its density equaled the density of a nucleus. Suppose that the mass is 70 kg and the density of the nucleus is 2.4 x 1017 kg/m³. Express your answer with the appropriate units.
- Estimate the probability that nuclear reactor-produced electronic antineutrino has an interaction with a proton when traversing the earth. Cross section for antineutrino interacting with a proton is 10 43 cm2, mean earth radius is 6.37x108 cm, and mean mass density of the Earth is 5.52 g/cm. Use 10 decimal places for the answer. Hint: Approximate Earth as iron. Your Answer: AnswerRADIOACTIVITY. LAW OF RADIOACTIVE DECAY Activity units: 1 Ci = 3.7 × 1010 Bq 1. Nuclear decay law: N = Noe¬at, The law of radioactive decay gives the quantitative relationship between the original number of nuclei present at time zero No and the number N at a later time t (sec), where e = 2.71828... is the base of the natural logarithm, and 2 is the decay constant for the nuclide (1/s). 2. Relationship between decay constant 1 and isotop half-life T1/2: 0.693 T1/2 1= In(2) Half-life Modality Radioisotope T1/2 where a is decay constant (1/s), T1/2 is isotope half- life (s). Carbon-11 20 minutes PET Fluorine-18 110 minutes PET Copper-64 | 12.7 hours PET 3. Activity or decay rate of a radioactive source A: Gallium-67 AN A = At where A is activity or decay rate of a radioactive lodine-123 source (Bq), N is number of nuclei present at time t Thallium-201 (s ), 2 is decay constant (1/s). 78.3 hours SPECT | 68 minutes Gallium-68 Technetum-99m PET 6.02 hours SPECT Indium-111 | 67.3 hours SPECT…Vapor pressure of a pure component (Psat) can be computed from the correlation equations. Beattie et al.(1951) gives the following equation between 50.00 to 160.60 °C for neopentane: 1136.462 log10 pat = 3.901633 + 4.99118 10-4 T T (temperature in K and vapor pressure is in atmospheres). The critical temperature (Te) and critical pressure (Pc) of neopentane are 160.60°C and 31.57 atmospheres respectively. Using the information given above and the class notes, answer the questions #1. 1. The acentric factor w is used a characterization parameter in phase behavior calculations. Acentric factor is a measure of sphericity of a molecule. The definition of w is given below. psat @ =- log10 --1.0 prat is calculated at T/Tc= 0.7 Pc Here Pal is the vapor pressure of the component and, P. and T are critical properties of the component. Psat/P¢and T/Tc must be unitless (T and Tc must be in R or K). Calculate the acentric factor of neopentane (CSH12) using Antoine vapor pressure equation. (In data…
