A model for quantized motion of an electron in a uniform magnetic field \(B\) states that the flux passing through the orbit of the electron is \(n(h/e)\) where \(n\) is an integer, \(h\) is Planck's constant and \(e\) is the magnitude of electron's charge. According to the model, the magnetic moment of an electron in its lowest energy state will be (\(m\) is the mass of the electron)
Bohr model, energy levels, hydrogen spectrum
Every question from past board papers on Bohr model, energy levels, hydrogen spectrum, newest paper first. Open any question for its full worked answer.
NEET UG 2025 question paper (official, booklet 45)
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A particle of mass \(m\) is moving around the origin with a constant force \(F\) pulling it towards the origin. If Bohr model is used to describe its motion, the radius \(r\) of the \(n^{th}\) orbit and the particle's speed \(v\) in the orbit depend on \(n\) as
NEET UG 2024 question paper (official, booklet S6)
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Match List I with List II.
List I (Spectral Lines of Hydrogen for transitions from): A. \(n_2=3\) to \(n_1=2\); B. \(n_2=4\) to \(n_1=2\); C. \(n_2=5\) to \(n_1=2\); D. \(n_2=6\) to \(n_1=2\)
List II (Wavelengths (nm)): I. 410.2; II. 434.1; III. 656.3; IV. 486.1
Choose the correct answer from the options given below :
NEET UG 2023 question paper (official, booklet G6)
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In hydrogen spectrum, the shortest wavelength in the Balmer series is \(\lambda\). The shortest wavelength in the Bracket series is :
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The radius of inner most orbit of hydrogen atom is \(5.3\times10^{-11}\) m. What is the radius of third allowed orbit of hydrogen atom?
NEET UG 2022 question paper (official, booklet R6)
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Let \(T_1\) and \(T_2\) be the energy of an electron in the first and second excited states of hydrogen atom, respectively. According to the Bohr's model of an atom, the ratio \(T_1 : T_2\) is :
NEET UG 2020 question paper (official, booklet E1)
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For which one of the following, Bohr model is not valid ?
NEET UG 2019 question paper (official, booklet P1)
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The total energy of an electron in an atom in an orbit is \(-3.4\) eV. Its kinetic and potential energies are, respectively :
NEET UG 2018 question paper (official, booklet EE)
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The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom, is
NEET UG 2017 question paper (official, booklet B)
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The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is :
NEET UG 2016 Phase 1 question paper (official, booklet A)
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Given the value of Rydberg constant is \(10^{7}\ m^{-1}\), the wave number of the last line of the Balmer series in hydrogen spectrum will be :
NEET UG 2016 Phase 2 question paper (official, booklet ZZ)
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If an electron in a hydrogen atom jumps from the 3rd orbit to the 2nd orbit, it emits a photon of wavelength \(\lambda\). When it jumps from the 4th orbit to the 3rd orbit, the corresponding wavelength of the photon will be