1

JEE Main 2021 (Online) 25th July Evening Shift

Numerical

+4

-1

Out of Syllabus

The nuclear activity of a radioactive element becomes $${\left( {{1 \over 8}} \right)^{th}}$$ of its initial value in 30 years. The half-life of radioactive element is _____________ years.

Your input ____

2

JEE Main 2021 (Online) 20th July Evening Shift

Numerical

+4

-1

Out of Syllabus

A radioactive substance decays to $${\left( {{1 \over {16}}} \right)^{th}}$$ of its initial activity in 80 days. The half life of the radioactive substance expressed in days is ____________.

Your input ____

3

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 ____

4

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 ____

Questions Asked from Atoms and Nuclei (Numerical)

Number in Brackets after Paper Indicates No. of Questions

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