11TH GRADE PRACTICE
Physics Problems: Nuclear physics, Grade 11
Nuclear composition, binding energy and radioactivity.
Here the conditions and analysis of the solution can be read without an account. In the simulator, you need to collect the same analyzes yourself: “Given,” formulas, order of steps and answer.
Problem statements
The answer options are there to check against, and the walkthrough opens under each problem.
Problem #76
Nuclear physicsWhat is the minimum distance an alpha particle can approach a gold nucleus with a speed of ?
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At the point of closest approach, all kinetic energy has turned into potential energy.
Answer
Problem #78
Nuclear physicsDuring the alpha decay of a resting uranium-238 nucleus, an alpha particle is emitted at a speed . What speed does the child core get? Compare its kinetic energy with the energy of an alpha particle.
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The nucleus was at rest, so the momenta of the fragment and the alpha particle are equal in magnitude.
The recoil core gets less than two percent of the energy - almost all of it is carried away by the alpha particle.
Answer
Problem #79
Nuclear physicsThe uranium-238 nucleus, as a result of alpha and beta decays, turned into a lead-206 nucleus. Determine the number of alpha and beta decays.
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The mass number is changed only by alpha particles, each carrying 4.
Result: ²³⁸₉₂U → ²⁰⁶₈₂Pb + 8·⁴₂He + 6·⁰₋₁e.
Answer
Problem #80
Nuclear physicsAvailable radioactive cesium-135 with half-life years Determine the mass of decayed cesium through years
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During the observation period, exactly five half-lives passed.
Answer
Problem #81
Nuclear physicsHow much energy will be released if the mass of the system decreases by ?
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This is where the conversion factor of 931 MeV per atomic mass unit is taken.
Answer
Problem #82
Nuclear physicsThe mass of a beryllium-9 atom is . Determine the mass defect and binding energy of the nucleus.
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We subtract the mass of the electron shell from the mass of the atom.
Answer
Problem #83
Nuclear physicsDetermine the mass defect, total and specific binding energy of the helium-4 nucleus.
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Specific binding energy shows how tightly each nucleon is bound.
Answer
Problem #84
Nuclear physicsHow energy changes in reactions and ?
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We compare the total masses before and after the reaction.
The mass has grown, which means energy has been absorbed.
The mass decreased - energy was released.
Answer
Problem #85
Nuclear physicsHow much energy will be released during complete fission uranium-235? How much uranium does a reactor consume in thermal power per year? ? Accept the energy of one division .
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A little more than a ton of uranium per year - versus millions of tons of coal at the same power.
Answer
Problem #86
Nuclear physicsDetermine the energy yield of the reaction of the deuterium compound with tritium .
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Sum of masses before reaction.
Sum of masses after reaction.
Thermonuclear fusion: mass lost, energy released.
Answer
Problem #87
Nuclear physicsDetermine the mass defect, total and specific binding energy of the oxygen-17 nucleus.
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Answer
Problem #88
Nuclear physicsAvailable drug with half-life days. How long will it take to remain ? What fraction of atoms decays in a time equal to half the half-life?
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Over half the half-life, approximately 29 percent decays.
Answer
Problem #89
Nuclear physicsDetermine the energy output of a nuclear reaction .
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Answer
Problem #91
Nuclear physicsDetermine the mass defect and binding energy of the boron-11 nucleus.
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The theory behind these problems
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Formulas by topic
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