Atoms and Nuclei Exercise - II | Answer Key

University:
Minnesota State University Moorhead
Course:
CHEM-150 | General Chemistry I
Academic year:

2023
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399

Pages:

1
Author:

Bidoggia5pt

ATOMS AND NUCLEI EXERCISE - II BOARD PROBLEMS 1. Express relationship of the mass of nucleus, M(A, Z) in terms of its binding energy and the masses of free protons and neutrons 2. State any two postulate of Bohr's theory of hydrogen atom 3. What is the maximum possible number of spectral lines observed when the hydrogen atom is in its second excited state ? justify your answer calculate the ratio of the maximum and minimum wavelength of radiation emitted in this process 4. Distinguish between (1) Isotopes and Isobar (2) mass defect and binding energy of nuclear 5. (a) The mass of a nucleus in its ground state is always less than the total mass of its constituent-neutrons and protons. Explain (b) Plot a graph showing the variation of potential energy of a pair of nucleons as a function of their separation. 6. Draw a plot showing the variation of Binding energy per nucleon versus mass number A. Explain with the help of this plot the release of energy in the processes of nuclear fission and fusion. Write a typical nuclear reaction in which a large amount of energy is released in the process of nuclear fission. 7. 8. Name the absorbing material used to control the reaction rate of neutron in a nuclear reactor. 9. Define the term activity of a radio nuclide. Write the S.I. unit 10. If the nucleons of a nucleus are separated far apart from each other, the sum of mases of all these nucleons is larger than the mass of the nucleus. Where does this mass difference come from ? Write two charactristic feature of nuclear force which distinguish it from coulomb's force. 11. 12. Anucleus of mass number A, has a mass defect m, Give the formula, for the biding energy per nucleon, of this nucelus. 13. Give the mass number and atomic number of elements on the right hand side of the decay process. 14. State the condition for controlled chain reaction to occur in a nuclear reactor. 15. Write the nuclear decay process for -decay of 16. Draw a plot of potential energy of a pair of nucleons as a function of their separations. Mark the regios where the nuclear force is (i) attractive and (ii) repulsive. Write any two characteristic features of nuclear forces. In a Geiger – Marsden experiment calculate the distance of closest approach to the nucleus of Z = 80, when an - particle of 8 MeV energy impinges on it before it comes momentarily to rest and reverses its direction. Define the activity of a given radioactive substance. Write its S.I. unit. 17. 18. 32 12 P.