NEET PhysicsNCERT Class 12Atoms and Nuclei

Atoms: NEET questions with solutions

NEET tests what alpha-particle scattering revealed about the nucleus, distance of closest approach, Bohr's postulates, how radius, speed, energy and frequency scale with n, the link between total, kinetic and potential energy, photon energies of hydrogen transitions, line counting, and de Broglie's view of the quantisation condition. Marks are lost by sign errors in E = −K = U/2, by mixing up n² and 1/n scalings, and by counting the longest-wavelength line as the largest jump.

Revise first: NCERT notes for Atoms

Questions

10 questions · answers after you pick

1In a hydrogen discharge tube, an electron drops from the n = 3 level to the n = 2 level. What is the energy of the emitted photon? (Eₙ =…Line spectra of the hydrogen atomEasySingle correct 2When a beam of alpha particles is fired at a thin gold foil, most pass almost straight through, but a very small fraction bounce back at…Alpha-particle scattering and Rutherford's nuclear modelEasySingle correct 3A hydrogen atom is in a state whose total energy is −3.4 eV. What are the kinetic energy and the electrostatic potential energy of its…Energy levels of the hydrogen atomMediumSingle correct 4An electron in a hydrogen atom is raised from the ground state (n = 1) to the n = 3 orbit. By what factors do its orbital radius and orbital…Bohr model of the hydrogen atomMediumSingle correct 5An alpha particle with kinetic energy 5.0 MeV heads directly towards a gold nucleus (Z = 79). How close does it get before stopping…Alpha-particle scattering and Rutherford's nuclear modelMediumSingle correct 6A student tries to use Bohr's formula to predict the spectrum of a neutral helium atom, which has two electrons, and the predictions…Bohr model of the hydrogen atomMediumAssertion–Reason 7A sample of hydrogen atoms is excited so that every atom reaches the n = 4 level. As the atoms return to the ground state by every possible…Line spectra of the hydrogen atomMediumSingle correct 8Take the radius of the first Bohr orbit of hydrogen as 0.053 nm. Using de Broglie's picture of a standing wave fitting around the orbit…De Broglie's explanation of Bohr's second postulateHardSingle correct 9In the Bohr model of hydrogen, what is the ratio of the electron's frequency of revolution in the n = 2 orbit to that in the n = 1 orbit?Bohr model of the hydrogen atomHardSingle correct 10Bohr proposed his postulates to rescue the nuclear atom from collapsing. Which of the following claims about an electron in a hydrogen atom…Bohr model of the hydrogen atomEasyStatement based

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