Atoms and Nuclei · Physics · AIIMS

15 eV is given to electron in 4th orbit then find its final energy when it comes out of H-atom.

If half life of an element is $$69.3 \mathrm{~h}$$, then how much of its percent will decay in 10th to 11th $$\mathrm{h}$$. Initial activity $$=50 ~\m...

Assertion : Heavy water is used to slow neutron in nuclear reactor. Reason : It does not react with slow neutron and mass of deuterium is comparable t...

Assertion : For an element generally $$N \geq Z$$ ( $$N=$$ number of neutrons, $$Z=$$ atomic number) Reason : Neutrons always experience attractive nu...

The half-life of a radioactive substance is $$20 \mathrm{~min}$$. The approximate time interval $$\left(t_2-t_1\right)$$ between the time $$t_2$$, whe...

Assertion If electrons in an atom were stationary, then they would fall into the nucleus. Reason Electrostatic force of attraction acts between negati...

Assertion Radioactive nuclei emits $$\beta^{-}$$-particles. Reason Electrons exist inside the nucleus.

A nuclear explosive is designed to deliver $$1 \mathrm{~MW}$$ power in the form of heat energy. If the explosion is designed with nuclear fuel consist...

Assertion : A beam of charged particles is employed in the treatment of cancer. Reason : Charged particles on passing through a material medium lose t...

Assertion : In He-Ne laser, population inversion takes place between energy levels of neon atoms. Reason : Helium atoms have a metastable energy level...

Assertion : In $$\alpha$$-decay atomic number of daughter nucleus reduces by 2 units from the parent nucleus. Reason : An $$\alpha$$-particle carries ...