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Atoms, Nuclei &...

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  • Question 1
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    According to ‘plum pudding model ’atoms on the whole are electrically neutral because

  • Question 2
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    Emission line spectra of different elements

  • Question 3
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    What is the shortest wavelength present in the Paschen series of spectral lines?

  • Question 4
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    Average angle of deflection of α-particles by a thin gold foil predicted by Thomson ’s model is

  • Question 5
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    The average lifetime of the first excited level of a hydrogen atom is 1.0 ×10−8 s. In the Bohr model, how many orbits does an electron in the n = 2 level complete before returning to the ground level?

  • Question 6
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    Each element is associated with

  • Question 7
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    Which of these statements about Bohr model is correct?

  • Question 8
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    Which of these statements about Bohr model hypothesis is correct?

  • Question 9
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    Which of these statements about Bohr model applied to hydrogen atom correct?

  • Question 10
    1 / -0.25

    Probability of backward scattering (i.e., scattering of α-particles at angles greater than 90 ∘) predicted by Thomson ’s model is

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