Atoms

CBSE Class 12 · Physics · 17 past questions

13 of 17 · show all

1. Q1 2026

   For question number 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled…

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2. Q2 2026

   In Bohr model of hydrogen atom, the electron makes a transition from n = 5 to n = 1 state. As a result, a…

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3. Q3 2025

   A hydrogen atom consists of an electron revolving in a circular orbit of radius r with certain velocity v…

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4. Q5 2025

   For Questions 13 to 16, two statements are given – one labelled Assertion (A) and other labelled Reason (R).…

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5. Q7 2024

   A proton and an alpha particle having equal velocities approach a target nucleus. They come momentarily to…

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6. Q8 2024

   An electron makes a transition from n = 2 level to n = 1 level in the Bohr model of a hydrogen atom. Its…

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7. Q10 2024

   Energy levels A, B and C of an atom correspond to increasing values of energy i.e. $E_A < E_B < E_C$. Let…

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8. Q11 2024

   Using Bohr's postulates, derive the expression for the radius of the nᵗʰ orbit of an electron in a hydrogen…

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9. Q12 2023

   A hydrogen atom makes a transition from n = 5 to n = 1 orbit. The wavelength of photon emitted is $\lambda$.…

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10. Q13 2023

    The ratio of maximum frequency and minimum frequency of light emitted in Balmer series of hydrogen spectrum…

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11. Q15 2023

    Hydrogen atom initially in the ground state, absorbs a photon which excites it to n = 5 level. The wavelength…

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12. Q16 2023

    The ground state energy of hydrogen atom is $-13.6$ eV. What is the potential energy and kinetic energy of an…

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13. Q17 2022

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