Self Studies

Atoms and Nucle...

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  • Question 1
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    A mixture consists of two radioactive materials A1 and A2 with half lives of 20 s and 10 s respectively. Initially the mixture has 40 g of A1 and 160 g of A2. The amount of the two in the mixture will become equal after

  • Question 2
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    The ratio of the speed of the electrons in the ground state of hydrogen to the speed of light in vacuum is

  • Question 3
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    In hydrogen atom, electron makes transition from n = 4 to n =1 level. Recoil momentum of the H atom will be

  • Question 4
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    A sodium atom is in one of the states labeled \'Lowest excited levels\'. It remains in that state for an average time of 10–8 s, before to makes a transition back to a ground state. What is the uncertainty in energy of that excited state

  • Question 5
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    An energy of 24.6 eV is required to remove one of the electrons from a neutral helium atom. The energy (in eV) required to remove both the electrons from a neutral helium atom is

  • Question 6
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    A hydrogen atom in its ground state absorbs 10.2 eV of energy. The orbital angular momentum is increased by
    (Given Planck\'s constant h = 6.6 × 10–34 J - s

  • Question 7
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    Hydrogen (H), deuterium (D), singly ionized helium (He+) and doubly ionized lithium (Li++) all have one electron around the nucleus. Consider n = 2 to n =1 transition. The wavelengths of emitted radiations are λ1, λ2, λ3 and λ4 respectively. Then approximately

  • Question 8
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    The number of revolutions per second made by an electron in the first Bohr orbit of hydrogen atom is of the order of

  • Question 9
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    Consider an electron (m = 9.1 x 10-31 kg) confined by electrical forces to move between rigid walls separated by 1.0 x 10-9 metre, which is about five atomic diameters. The quantised energy value for the lowest stationary state is

  • Question 10
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    α–particles of energy 400 KeV are bombarded on nucleus of 82Pb. In scattering of α–particles, its minimum distance from nucleus will be

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