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12th Physics - Atomic and Nuclear Physics Model Question Paper 1 8682895000 Jan-06 , 2020

Atomic and Nuclear Physics

12th Physics - Atomic and Nuclear Physics Model Question Paper 1

Atomic and Nuclear Physics Model Question Paper 1

12th Standard

    Reg.No. :
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Physics

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5

  1. The charge of cathode rays particle is _____.

    (a)

    Positive

    (b)

    negative

    (c)

    neutral

    (d)

    not defined

  2. The ratio of the wavelengths radiation emitted for the transition from n = 2 to n = 1 in Li++, He+ and H is _____.

    (a)

    1:2:3

    (b)

    1:4:9

    (c)

    3:2:1

    (d)

    4:9:36

  3. Mp denotes the mass of the proton and Mn denotes mass of a neutron. A given nucleus of binding energy B, contains Z protons and N neutrons. The mass M(N, Z) of the nucleus is given by _____.(where c is the speed of light)

    (a)

    M (N,Z) = NMn + ZMp - Bc2

    (b)

    M (N,Z) = NMn + ZMp + Bc2

    (c)

    M (N,Z) = NMn + ZMp - B/c2

    (d)

    M (N,Z) = NMn + ZMp + B/c2

  4. The ionization energy of hydrogen atom is -13.6e V. The energy corresponding to a transition between 3rd and 4th orbit is ______________.

    (a)

    3.40 eV

    (b)

    1.51 eV

    (c)

    0.85 eV

    (d)

    0.66 eV

  5. The total energy of electrons in the ground state of a hydrogen atom is -13.6 eV. The k.E of an electron in the first excited state is ____________.

    (a)

    6.8 eV

    (b)

    13.6 eV

    (c)

    1.7 eV

    (d)

    3.4 eV

    6. 5 x 2 = 10

  6. Write a general notation of nucleus of element X. What does each term denote?

  7. What is isotope? Give an example.

  8. What are the constituent particles of neutron and proton?

  9. Classify the neutrons according to their kinetic energy.

  10. What causes the sun to expand?

    11. 5 x 3 = 15

  11. Discuss the properties of neutrino and its role in beta decay.

  12. Explain the idea of carbon dating.

  13. What does a neutron moderator do?

  14. What is the diameter of H2 atom?

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

    16. 4 x 5 = 20

  16. Calculate the radius of the earth if the density of the earth is equal to the density of the nucleus.[mass of earth 5.97 x 1024 kg].

  17. Calculate the mass defect and the binding energy per nucleon of the \(_{ 47 }^{ 108 }{ Ag }\) nucleus. [atomic mass of Ag = 107.905949]

  18. A radioactive nucleus X converts into stable nucleus Y. Half-life of X is 50 years. Calculate the age of the radioactive sample when the ratio of X and Y is 1:15.

  19. For a radioactive material, half-life period is 600s. If initially there are 600 number of molecules, find the time taken for disintegration of 450 molecules and the rate of disintegration.

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