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ATOMS QUIZ-12

Dear Readers,

JEE Advanced Physics Syllabus can be referred by the IIT aspirants to get a detailed list of all topics that are important in cracking the entrance examination. JEE Advanced syllabus for Physics has been designed in such a way that it offers very practical and application-based learning to further make it easier for students to understand every concept or topic by correlating it with day-to-day experiences. In comparison to the other two subjects, the syllabus of JEE Advanced for physics is developed in such a way so as to test the deep understanding and application of concepts.

Q1. How many revolutions does an electron complete in one second in the first orbit of hydrogen atom?
  •  6.62×10^15
  •  100
  •  1000
  •  1
Solution


Q2. Angular momentum (L) and radius (r) of a hydrogen atom are related as
  •  Lr= constant
  •  Lr^2= constant
  •  Lr^4= constant
  •  None of these
Solution


Q3. The total energy of an electron in the ground state of hydrogen atom is -13.6 eV. The potential energy of an electron is the ground state of Li^(2+) ion will be
  •   122.4 eV
  •  -122.4 eV
  •  244.8 eV
  •  -244.8 eV
Solution

Q4. If elements with principal quantum number n>4 were not allowed in nature, the number of possible elements would have been
  •  32
  •  60
  •  64
  •  4
Solution


Q5. An electron collides with a hydrogen atom in its ground state and excites it to n=3. The energy given to hydrogen atom in this inelastic collision is [Neglect the recoiling of hydrogen atom]
  •  10.2 eV
  •  12.1 eV
  •  12.5 eV
  •  None of these
Solution


Q6. In terms of Rydberg constant R, the shortest wavelength in Balmer series of hydrogen atom spectrum will have wavelength
  •  1/R
  •  4/R
  •  3/2R
  •  9/R
Solution

(b)
Q7. An atom emits a spectral line of wavelength λ when an electron makes a transition between levels of energy E_1 and E_2. Which expression correctly relates λ,E_1 and E_2?
  •  Î»=hc/(E_1+E_2 )
  •  Î»=2hc/(E_1+E_2 )
  •  Î»=2hc/(E_1-E_2 )
  •  Î»=hc/(E_1-E_2 )
Solution


Q8. In which of the following transitions will the wavelength be minimum?
  •  n_1=5 to n_2=4
  •  n_1=4 to n_2=3
  •  n_1=3 to n_2=2
  •  n_1=2 to n_2=1
Solution


Q9. An electron in a Bohr orbit of hydrogen atom with the quantum number n_2 has an angular momentum 4.2176×10^(-34) kg m^2 s^(-2). If the electron drops from this level to the next lower level, the wavelength of this line is
  •  18 nm
  •  187.6 pm
  •  1876 â„«
  •  1.876×10^4 â„«
Solution


Q10. In hydrogen and hydrogen-like atoms, the ratio of E_4n-E_2n and E_2n-E_n varies with atomic number z and principal quantum number n as
  •  z^2/n^2
  •  z^4/n^4
  •  z/n
  • None of these
Solution


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