Atomic and Nuclear physics Three Marks Questions

12th Standard EM

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Physics

Time : 01:00:00 Hrs
Total Marks : 45
    15 x 3 = 45
  1. Explain the J.J. Thomson experiment to determine the specific charge of electron

  2. Discuss the Millikan's oil drop experiment to determine the charge of an electron.

  3. Explain the idea of carbon dating.

  4. Discuss the process of nuclear fission and its properties.

  5. Find the
    (i) angular momentum
    (ii) velocity of the electron in the 5th orbit of hydrogen atom.
    (h = 6.6 × 10–34 Js, m = 9.1 × 10–31 kg)

  6. Calculate the average atomic mass of chlorine if no distinction is made between its different isotopes?

  7. What does a neutron moderator do?

  8. Write the properties of neutrino?

  9. What is the diameter of H2 atom?

  10. Show that the decay rate 'R' of a sample of a radionuclide is related to the number of radioactive nuclei 'N' at the same instant by the expression R = λN.

  11. Digine atomic mass unit. Find its energy equivalent in MeV

  12. If the total number of neutrons and protons in a nuclear reaction is conserved how than is the energy absorbed or evolved in the reaction? Explain.

  13. Energy released per fission of a nucleus is of the order of 200 MeV whereas that per fusion, is of the order of 10 MeV. But a fusion bomb (Hydrogen bomb) is said to be more powerful than a fission bomb. Explain why?

  14. With respect to power generation, what are the relative advantages and disadvantages of fusion type and Fission type reactors?

  15. What are radioactive elements? What are the factors that affect radio activity?

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