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JEE Main Atoms and Nuclei questions

10 Physics questions on Atoms and Nuclei as asked in JEE Main, newest first. 8 come with a worked solution.

  1. If a radioactive element having half-life of 30 min is undergoing beta decay, the fraction of radioactive element remains undecayed after 90 min. will be

    2023 · with solution

  2. The energy levels of an atom is shown in figure. Which one of these transitions will result in the emission of a photon of wavelength 124.1nm ? Given (h = 6.62 × 10^-34 Js) [figure]

    2023 · with solution

  3. The ratio of the density of oxygen nucleus (^16_8O) and helium nucleus (^4_2He) is

    2023

  4. Consider the following radioactive decay process ^218_84A →[α] A_1 →[β^-] A_2 →[γ] A_3 →[α] A_4 →[β^+] A_5 →[γ] A_6 The mass number and the atomic number of A_6 are given by:

    2023 · with solution

  5. A photon is emitted in transition from n = 4 to n = 1 level in hydrogen atom. The corresponding wavelength for this transition is (given, h = 4 × 10^-15 eVs) :

    2023 · with solution

  6. A nucleus disintegrates into two smaller parts, which have their velocities in the ratio 3:2. The ratio of their nuclear sizes will be (x/3 )^1/3. The value of 'x' is:-

    2023 · with solution

  7. Assume that protons and neutrons have equal masses. Mass of a nucleon is 1.6 × 10^-27 kg and radius of nucleus is 1.5 × 10^-15 A^1/3 m. The approximate ratio of the nuclear density and water density is n × 10^13. The…

    2023 · with solution

  8. The energy released per fission of nucleus of ^240X is 200 MeV. The energy released if all the atoms in 120g of pure ^240X undergo fission is __________ × 10^25 MeV. (Given N_A = 6 × 10^23)

    2023 · with solution

  9. The wavelength of the radiation emitted is λ_o when an electron jumps from the second excited state to the first excited state of hydrogen atom. If the electron jumps from the third excited state to the second orbit of…

    2023 · with solution

  10. A radioactive element ^210_84X emits two α-particles, one electron and two positrons. The product nucleus is represented by ^Z_PY. The value of P is

    2023

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