1

JEE Main 2021 (Online) 17th March Evening Shift

Numerical

+4

-1

A particle of mass m moves in a circular orbit in a

central potential field U(r) = U

are applied, radii of possible

orbitals r

central potential field U(r) = U

_{0}r^{4}. If Bohr's quantization conditionsare applied, radii of possible

orbitals r

_{n}vary with $${n^{{1 \over \alpha }}}$$, where $$\alpha$$ is ____________.Your input ____

2

JEE Main 2021 (Online) 16th March Morning Shift

Numerical

+4

-1

The first three spectral lines of H-atom in the Balmer series are

given $$\lambda$$

The value of x, to the nearest integer, is _________.

given $$\lambda$$

_{1}, $$\lambda$$_{2}, $$\lambda$$_{3}considering the Bohr atomic model, the wave lengths of first and third spectral lines $$\left( \frac{\lambda_{1} }{\lambda_{3} } \right) $$ are related by a factor of approximately 'x' $$\times$$ 10^{$$-$$1}.The value of x, to the nearest integer, is _________.

Your input ____

3

JEE Main 2020 (Online) 5th September Morning Slot

Numerical

+4

-0

A particle of mass 200 MeV/c

$${N \over 4}$$. The value of N is :

(Given the mass of the hydrogen atom to be 1 GeV/c

^{2}collides with a hydrogen atom at rest. Soon after the collision the particle comes to rest, and the atom recoils and goes to its first excited state. The initial kinetic energy of the particle (in eV) is$${N \over 4}$$. The value of N is :

(Given the mass of the hydrogen atom to be 1 GeV/c

^{2}) ______ .Your input ____

4

JEE Main 2020 (Online) 8th January Evening Slot

Numerical

+4

-0

The first member of the Balmer series of
hydrogen atom has a wavelength of 6561 Å.
The wavelength of the second member of the
Balmer series (in nm) is:

Your input ____

Questions Asked from Atoms and Nuclei (Numerical)

Number in Brackets after Paper Indicates No. of Questions

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