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12th Standard English Medium Physics Subject Atomic and Nuclear physics Book Back 1 Mark Questions with Solution Part - I

12th Standard

    Reg.No. :
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Physics

Time : 00:30:00 Hrs
Total Marks : 5

    Part I

    5 x 1 = 5
  1. Suppose an alpha particle accelerated by a potential of V volt is allowed to collide with a nucleus of atomic number Z, then the distance of closest approach of alpha particle to the nucleus is _____.

    (a)

    \(14.4\frac { Z }{ V } \mathring { A } \)

    (b)

    \(14.4\frac { V }{ Z } \mathring { A } \)

    (c)

    \(1.44\frac { Z }{ V } \mathring { A } \)

    (d)

    \(1.44\frac { V }{ Z } \mathring { A } \)

  2. Atomic number of H-like atom with ionization potential 122.4 V for n = 1 is _____.

    (a)

    1

    (b)

    2

    (c)

    3

    (d)

    4

  3. The charge of cathode rays particle is _____.

    (a)

    Positive

    (b)

    negative

    (c)

    neutral

    (d)

    not defined

  4. 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

  5. If the nuclear radius of 27Al is 3.6 fermi, the approximate nuclear radius of 64Cu, in femi is _____.

    (a)

    2:4

    (b)

    1.2

    (c)

    4.8

    (d)

    3.6

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