Atomic Models and Scattering of Alpha particle PYQs: JEE Mains Physics

Showing 1–9 of 9 questions

1. 1. If an alpha particle with energy 7.7 MeV is bombarded on a thin gold foil, the closest distance from nucleus it can reach is _________ m.
   (Atomic number of gold \(=79\) and \(\frac{1}{4 \pi \epsilon_0}=9 \times 10^9\)in SI units) 2026 Hard
2. 2. In Rutherford's alpha-particle scattering experiment, only a few alpha particles rebound back because
   A. The size of gold nucleus is very small as compared to the size of gold atom.
   B. Alpha particle and gold nucleus have equal charge.
   C. The impact parameter is minimum for a few alpha particles.
   D. A few alpha particles have very high kinetic energy.
   E. Only a few alpha particles undergo head-on collision with the nuclei.
   Choose the correct answer from the options given below: 2026 Medium
3. 3. Assuming the validity of Bohr's atomic model for hydrogen like ions the radius of \(\mathrm{Li}^{++}\)ion in its ground state is given by \(\frac{1}{X} a_0\), where \(X=\) _______. (Where \(\mathrm{a}_0\) is the first Bohr's radius.) 2025 Easy
4. 4. Considering Bohr's atomic model for hydrogen atom :
   (A) the energy of H atom in ground state is same as energy of \(\mathrm{He}^{+}\)ion in its first excited state.
   (B) the energy of H atom in ground state is same as that for \(\mathrm{Li}^{++}\)ion in its second excited state.
   (C) the energy of H atom in its ground state is same as that of \(\mathrm{He}^{+}\)ion for its ground state.
   (D) the energy of \(\mathrm{He}^{+}\)ion in its first excited state is same as that for \(\mathrm{Li}^{++}\)ion in its ground state
   Choose the correct answer from the options given below : 2025 Easy
5. 5. The longest wavelength associated with Paschen series is _______. (Given \(R_H=1.097 \times 10^7 \mathrm{SI}\) unit) 2024 Hard
6. 6. When a hydrogen atom going from \(\mathrm{n}=2\) to \(\mathrm{n}=1\) emits a photon, its recoil speed is \(\frac{\mathrm{x}}{5} \mathrm{~m} / \mathrm{s}\). Where \(\mathrm{x}=\) _______. (Use : mass of hydrogen atom\(\left.=1.6 \times 10^{-27 /} \ \mathrm{kg}\right)\) 2024 Hard
7. 7. Choose the correct option from the following options given below 2022 Medium
8. 8. \(\sqrt{d_{1}}\) and \(\sqrt{d_{2}}\) are the impact parameters corresponding to scattering angles \(60^{\circ}\) and \(90^{\circ}\) respectively, when an \(\alpha\) particle is approaching a gold nucleus. For \(d_{1}=x d_{2}\), the value of \(x\) will be ________ 2022 Medium
9. 9. Match List \(- I\) (Experiment performed) with List \(-II\) (Phenomena discovered/associated) and select the correct option from the options given the lists

   List \(- I\)	List \(- II\)
   \((1)\) Davisson and Genner	\((i)\) Wave nature of electrons
   \((2)\) Millikan's oil drop experiment	\((ii)\) Charge of an electron
   \((3)\) Rutherford experiment	\((iii)\) Quantisation of energy levels
   \((4)\) Franck-Hertz experiment	\((iv)\) Existence of nucleus

   2014 Medium

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