17 JEE Main 2021 Atomic Physics previous-year questions with verified answers and step-by-step solutions.
These are the JEE Main 2021 previous-year questions from the Atomic Physics chapter of Physics. Each links to a full solution with a verified answer key. To see the whole chapter across all years, visit the Atomic Physics chapter hub.
The K α X-ray of molybdenum has wavelength 0 . 071   nm . If the energy of a molybdenum atom with a K electro…
The recoil speed of a hydrogen atom after it emits a photon in going from n = 5 state to n = 5 state will be
The first three spectral lines of H -atom in the Balmer series are given λ 1 , λ 2 , λ 3 considering the…
The atomic hydrogen emits a line spectrum consisting of various series. Which series of hydrogen atomic spectra is lyin…
In the given figure, the energy levels of hydrogen atom have been shown along with some transitions marked A , B , C ,…
The radiation corresponding to 3 → 2 transition of a hydrogen atom falls on a gold surface to generate photoelect…
If λ 1 and λ 2 are the wavelengths of the third member of Lyman and first member of the Paschen series respec…
In Bohr's atomic model, the electron is assumed to revolve in a circular orbit of radius 0 . 5   A ∘ . If th…
If an electron is moving in the n th  orbit of the hydrogen atom, then its velocity ( v n ) for the n th  orb…
A particle of mass m moves in a circular orbit in a central potential field U ( r ) = U 0 r 4 . If Bohr's quantization…
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