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JEE Main 2025 (Online) 24th January Morning ShiftMCQEasy📈 Topic in 5% papers+4−1
Ques. 1JEE Main 2025, 24 January (Morning Shift)

During the transition of electron from state A to state C of a Bohr atom, the wavelength of emitted radiation is 2000 and it becomes 6000 when the electron jumps from state B to state C. Then the wavelength of the radiation emitted during the transition of electrons from state A to state B is

  1. 4000
  2. 6000
  3. 2000
  4. 3000

Answer

(4) 3000

Solution

Energy of the photon: E= hc , and EAC=EAB+EBC.

[figure]

1 AB= 12000- 16000= 13000

AB=3000

Answer: (4)

Keep practising — Atoms

Ques. 2JEE Main 2025, 22 January (Morning Shift)

An electron in the ground state of the hydrogen atom has the orbital radius of 5.3 10-11 m while that for the electron in third excited state is 8.48 10-10 m. The ratio of the de Broglie wavelengths of electron in the ground state to that in the excited state is

  1. 4
  2. 3
  3. 9
  4. 16

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