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) = U0r4. If Bohr's quantization conditions
are applied, radii of possible
orbitals rn vary with $${n^{{1 \over \alpha }}}$$, where $$\alpha$$ is ____________.
central potential field U(r) = U0r4. If Bohr's quantization conditions
are applied, radii of possible
orbitals rn 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 spectral lines of H-atom in the Balmer series are
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 _________.
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 2021 (Online) 25th February Evening Shift
Numerical
+4
-1
The wavelength of an X-ray beam is 10$$\mathop A\limits^o $$. The mass of a fictitious particle having the same energy as that of the X-ray photons is $${x \over 3}h$$ kg. The value of x is __________. (h = Planck's constant)
Your input ____
4
JEE Main 2020 (Online) 2nd September Morning Slot
Numerical
+4
-0
When radiation of wavelength $$\lambda $$ is used to
illuminate a metallic surface, the stopping
potential is V. When the same surface is
illuminated with radiation of wavelength 3$$\lambda $$,
the stopping potential is
$${V \over 4}$$. If the threshold
wavelength for the metallic surface is n$$\lambda $$ then
value of n will be __________.
Your input ____
Questions Asked from Atoms and Nuclei (Numerical)
Number in Brackets after Paper Indicates
No. of Questions
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