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JEE 2020 Revision Quiz: Atoms and Nuclei Quiz

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Question 1

The energy levels of a hypothetical one electron atom system are given by

, where (n = 1, 2, 3,.....) The wavelength of emitted photon corresponding to transition from first excited level to ground level is about:

Question 2

In a hydrogen-like atom, an electron in the ground state requires 476 eV to reach an excited level with quantum number 2n. If it makes a transition from this level to a lower level with quantum number n, it emits a photon of energy 40.8 eV. (The ground state energy of hydrogen atom is -13.6 eV). Calculate the ionization energy of the atom.

Question 3

Neptunium undergoes in a series of decays. The half-life of Np is given as 1.28×10¹⁵ s. Calculate the number of disintegrations per second occurring in 1 g of it. (Given, the atomic number of neptunium is 93.)

Question 4

The activity of a radioactive substance is given as one millicurie, what will be its value in terms of Rutherford?

Question 5

The ratio of minimum wavelengths of Lyman and Balmer series will be

Question 6

The fraction of the initial number of radioactive nuclei which remain undecayed after half of a half-life of the radioactive sample is

Question 7

Let n₁ be the frequency of the series limit of the Lyman series, n₂ be the frequency of the first line of the Lyman series, and n₃ be the frequency of the series limit of the Balmer series.

Question 8

An electron makes transition inside a hydrogen atom. The orbital angular momentum of the electron may change by

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May 27JEE & BITSAT