10 JEE Main 2019 Atomic Physics previous-year questions with verified answers and step-by-step solutions.
These are the JEE Main 2019 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.
In   L i + + ,electron in first Bohr orbit is excited to a level by a radiation of wavelength   λ .When…
In a Frank - Hertz experiment, an electron of energy 5.6   e V passes through mercury vapour and emerges with an…
Radiation coming from transitions n = 2 to n = 1 of hydrogen atoms fall on H e + ions in n = 1 and n = 2 states. The po…
A hydrogen atom, initially in the ground state is excited by absorbing a photon of wavelength 980 Ã…. The radius of the…
The electron in a hydrogen atom first jumps from the third excited state to the second excited state and subsequently t…
A H e + ion is in its first excited state. Its ionization energy is:
Taking the wavelength of first Balmer line in hydrogen spectrum ( n = 3 to n = 2 ) as 660 n m , the wavelength of the 2…
An excited H e + ion emits two photons in succession, with wavelengths 108.5 n m and 30.4 n m in making a transition to…
A particle of mass m moves in a circular orbit in a central potential field U r = 1 2 k r 2 . If Bohr's quantization co…
In a hydrogen like atom, when an electron jumps from the M-shell to the L-shell, the wavelength of emitted radiation is…