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Atoms and Nucle...

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  • Question 1
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    Each element is associated with

  • Question 2
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    For ionising an excited hydrogen atom, the magnitude of energy required (in eV) will be

  • Question 3
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    According to ‘plum pudding model’ atoms on the whole are electrically neutral because

  • Question 4
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    Mass equivalent to an energy of 931 MeV is

  • Question 5
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    There is a beam of electrons and protons moving parallel to each other in the same direction. Then they

  • Question 6
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    The material used for making thermionic cathode must have

  • Question 7
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    The following question has four choices out of which ONLY ONE is correct.

    Activity of a radioactive sample decreases to (1/3)rd of its original value in 3 days. Then, in 9 days its activity will become

  • Question 8
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    If λ = 10-10 m changes to λ = 0.5 × 10-10 m, find the energy difference (△E) given to the particle.

  • Question 9
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    What is the radius of the first orbit of H atom?

  • Question 10
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    Which of these statements correctly describe the atomic model according to classical electromagnetic theory ?

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