Modern Physics
Which of the following forces is primarily responsible for holding protons and neutrons together within the nucleus of an atom?
A nuclear reaction results in a mass defect of 0.001 atomic mass units (amu). How much energy is released in this reaction? (Note: 1 , amu = 1.66054 × 10^{-27} , kg and )
What is the key difference between spontaneous and induced fission?
What is the primary source of energy production in the Sun?
How does the strong force change as the distance between nucleons increases?
In a nuclear decay, a nucleus emits several particles. If the total momentum of the emitted particles is measured to be non-zero, what can be said about the momentum of the resulting nucleus?
In a fission reaction, 235U absorbs a neutron and splits into 141Ba, 92Kr, and releases three neutrons. If the mass defect of this reaction is 0.215 , amu, how much energy is released?
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The decay constant of a radioactive material is 0.01 , s^{-1}. What is its half-life?
A rock sample contains two isotopes: a parent isotope that decays into a daughter isotope. The half-life of the parent isotope is 1 billion years. If the ratio of daughter to parent isotopes in the rock is 3:1, how old is the rock?
A radioactive isotope has a half-life of 10 years. If you start with 1000 atoms of this isotope, how many atoms will remain after 30 years?