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Most Important Selected Qs for JEE AdvancedChemistryStructure of Atom

Electrons present in the ground state in a sample of H -atoms excite themselves by absorbing a photon of 2.04 10⁻¹⁸ ~J energy. What will be the maximum wavelength of emitted photons when electrons return to the ground state (approx.)?

Options

  1. A656 nm
  2. B486.2 nm
  3. C1312 nm
  4. D1880 nm

Correct answer

D. 1880 nm

Step-by-step solution

Energy absorbed = 2.04 10⁻¹⁸ 1.6 10⁻¹⁹ =12.75 eV Excitation is from n =1 to n = 4 n =4 to n =3 on de-excitation will have maximum wavelength = 1240 1.51-0.85 ~nm

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