9TH GRADE PRACTICE
Physics Problems: Nuclear physics, Grade 9
Communication energy, reactions, energy and radiation protection.
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 #58
Binding energy, fission and reactorEvaluate the statement: A heavy nucleus can fission, releasing energy and neutrons that can cause new fissions.
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Self-maintenance requires critical conditions; The critical mass depends not only on the amount of substance, but also on the shape, composition and loss of neutrons.
Answer
Problem #59
Binding energy, fission and reactorEvaluate the statement: The concept of "Mass Defect and Binding Energy" means: The device maintains a controlled chain reaction and removes heat to subsequently produce electricity.
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Higher binding energy per nucleon usually means a more stable nucleus.
Answer
Problem #60
Nuclear physicsThe mass defect of the system is 0.002 amu. Find the energy in MeV using 1 amu c² = 931.5 MeV.
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Answer
Problem #61
Ionizing radiation and thermonuclear fusionEvaluate the statement: Ionizing radiation damages molecules and cells, and the risk depends on the dose, type, and conditions of exposure.
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The protection combines reduced time, increased distance and a suitable shield without replacing dose control.
Answer
Problem #62
Ionizing radiation and thermonuclear fusionEvaluate the statement: The concept of “Thermonuclear reaction” means: Elementary particles have no observable internal structure at the level under consideration, and antiparticles have opposite charges.
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Fusion powers the stars; on Earth, a controlled reaction requires confinement of hot plasma.
Answer
Problem #63
radioactivityThe mass of the radioactive isotope was 80 g. The half-life was 4 days. How much isotope will remain after 12 days?
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Answer
The theory behind these problems
Work through the topic if a problem will not give in.
Formulas by topic
Look up symbols and units of measurement in the reference.