Problem 1 |
Concept: |
Elementary Particles |
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Not finished! |
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Level: Basic |
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Emission of which particle below will decrease the mass number by 1, but have no affect on the atomic number? |
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a gamma photon |
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a neutron |
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a beta particle |
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an alpha particle |
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Problem 2 |
Concept: |
Nuclear reactions |
0 |
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Level: Basic |
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When 59Cu undergoes positron emission, what is the immediate nuclear product? |
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59Zn |
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58Cu |
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59Ni |
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58Ni |
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Problem 3 |
Concept: |
Radioactivity |
0 |
Not finished! |
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Level: Basic |
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Which of the nuclides is most likely radioactive? |
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39K |
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218At |
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28Si |
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2H |
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Problem 4 |
Concept: |
Band of Stability |
0 |
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Level: Basic |
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Which of the unstable nuclides below will result in electron capture or positron emission during radioactive decay? 192Os is the most stable isotope of this element. |
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194Os |
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193Os |
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195Os |
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172Os |
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Problem 5 |
Concept: |
Half-life and rate constant |
0 |
Not finished! |
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Level: Basic |
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How much time in hours would it take for a 2.649 g sample of 18F to decay to a mass of 1.465 g if it has a half-life of 6.5880e+3 s. |
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Enter answer here: |
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Problem 6 |
Concept: |
Age of material |
0 |
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Level: Intermediate |
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A rock containing 238U and 206Pb was examined to determine its approximate age. The sample of a rock contained 1.611 g of 206Pb and 10.67 g 238U. Assuming no lead was originally present and that all lead formed from 238U remained in the rock, what is the age of the rock (in years)? The half-life of 238U is 4.500e+9 yr. |
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Enter answer here: |
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Problem 7 |
Concept: |
Nuclear Binding Energies |
0 |
Not finished! |
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Level: Basic |
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How many kJ of energy are released to form one mole of 87Rb from protons and neutrons if the atom has a mass of 86.9091870 amu? Please remember to include the mass of electrons in the calculation. Given the mass of a proton is 1.007825 amu |
Following is the - complete Answer -&- Explanation: for the first four questions ( i.e. Q.1 - to - Q.4 ) , of the given ....: Question Set - in.........Typed Format...
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Question - (1): Answer -&- Explanation:
Answer:
Option - (b): a Neutron
Explanation:
Following is the complete Explanation, for the above Answer, in....Typed Format...
We know, with a neutron emission, the atom of a radioactive element , loses one neutron ONLY, which doesn't change the number of protons, of the atom. Thus, even after the emission of a neutron, the atomic number, of the atom remains constant. But , with since with emission of a neutron, the atom loses a neutron, the mass number , of the atom, changes ONLY...
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Question - (2): Answer -&- Explanation:
Answer:
Option - ( C ) : 59Ni
Explanation:
Following is the complete Explanation - for the above Answer, in.....Typed Format.....
Following is the complete nuclear reaction, of positron decay / emission of : Copper ( Cu )
59Cu29 59Ni28 + e+( positron ) + ve( emission of energy )
i.e. as we can see above, due to positron emission, the atomic number of copper ( i.e. Cu ) , decreases, by one, and the mass number , of copper ( Cu ) , remains the same. Thus positron emission of copper leads to the creation of ----
--- 59Ni28
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Question - (3): Answer -&- Explanation:
Answer:
Option - (b) : 218At
Explanation:
The isotope of Astatine: 218At, will be radioactive , because this nuclide is not stable, and it undergoes , alpha ( ) and beta ( ) decay, --- respectively, and is therefore Radioactive nuclide.
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Question - (4): Answer -&- Explanation:
Answer:
Option - ( d ) : 172Os
Explanation:
Since, this radioactive isotope of osmium - i.e. 172Os, goes through radioactive decay - of positron emission
( +decay ) ---- this will be our Answer.....
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Problem 1 Concept: Elementary Particles 0 Not finished! Level: Basic Emission of which particle below will...
Problem 5 Concept: Half-life and rate constant 0 Not finished! Level: Basic How much time in hours would it take for a 2.649 g sample of 18F to decay to a mass of 1.465 g if it has a half-life of 6.5880e+3 s. Enter answer here: Problem 6 Concept: Age of material 0 Not finished! Level: Intermediate A rock containing 238U and 206Pb was examined to determine its approximate age. The sample of a rock contained 1.611 g of 206Pb...
1.Describe what happens to a carbon-11 atom when it undergoes positron emission. The decay of a carbon-11 atom _____(options;changes a nuetron into proton, changes proton into neutron, is hit with a neutron, reconfigures its protons and neutrons) and this causes it to emit______(options; a negatively charged electron sized particle, a positively charged electron sized partticle, two atoms and several neutrons, two neutrons and two protons) 2.An atom undergoes radioactive decay according to this equation: ___. What is the identity of...
Questions 1-4 1.Calculate the mass defect and the binding energy/nucleon of the nuclide Be, which has a mass of 9.012 182 24 amu. The mass of a proton is 1.007 276 47 amu and the mass of a neutron is 1.008 664 90. One amu - 1.6605 x 10 kg and the speed of light is 3.00 x 10 m/s. 2. Write the nuclear equation for each of the following reactions. Refer to a periodic table. a. the alpha decay...