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$$-$$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)
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
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
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) = 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 ____
Questions Asked from Atoms and Nuclei (Numerical)
Number in Brackets after Paper Indicates No. of Questions
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