1

JEE Main 2021 (Online) 25th July Evening Shift

Numerical

+4

-1

From the given data, the amount of energy required to break the nucleus of aluminium $$_{13}^{27}$$Al is __________ x $$\times$$ 10

Mass of neutron = 1.00866 u

Mass of proton = 1.00726 u

Mass of Aluminium nucleus = 27.18846 u

(Assume 1 u corresponds to x J of energy)

(Round off to the nearest integer)

^{$$-$$3}J.Mass of neutron = 1.00866 u

Mass of proton = 1.00726 u

Mass of Aluminium nucleus = 27.18846 u

(Assume 1 u corresponds to x J of energy)

(Round off to the nearest integer)

Your input ____

2

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 ____

3

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 ____

4

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 ____

Questions Asked from Atoms and Nuclei (Numerical)

Number in Brackets after Paper Indicates No. of Questions

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