Embibe Experts Solutions for Chapter: Structure of Atom, Exercise 2: EXERCISE-2

If the nitrogen atom had electronic configuration $1{\mathrm{s}}^7,$ it would have energy lower that of normal ground state configuration $1{\mathrm{s}}^2 2{\mathrm{s}}^{2}2{\mathrm{p}}^3,$ because the electrons would be closer to the nucleus. Yet $1{\mathrm{s}}^7$ is not observed because it violates :-

Consider the following nuclear reactions involving $\mathrm{X} \& \mathrm{Y}.$

$\mathrm{X}⟶\mathrm{Y}+{}_2{}^4\mathrm{He}$

$\mathrm{Y}⟶{{}_8\mathrm{O}}^{18}+{{}_1\mathrm{H}}^1$

If both neutrons as well as protons in both the sides are conserved in nuclear reaction then identify period number of $\mathrm{X} \&$ moles of neutrons in $4.6 \mathrm{g}$ of $\mathrm{X}$

Electromagnetic radiations having $\mathrm{\lambda }=310\mathrm{\AA }$ are subjected to a metal sheet having work function $=12.8\mathrm{eV}.$ What will be the velocity of photoelectrons with maximum Kinetic Energy....

Uncertainty in position is twice the uncertainty in momentum Uncertainty in velocity is :-

If $\mathrm{m}=$ magnetic quantum number and $\mathrm{\ell }=$ azimuthal quantum number then :-

The energies of energy levels $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ for a given atom are in the sequence ${\mathrm{E}}_{\mathrm{A}}<{\mathrm{E}}_{\mathrm{B}}<{\mathrm{E}}_{\mathrm{C}}.$ If the radiantions of wavelengths ${\mathrm{\lambda }}_1, {\mathrm{\lambda }}_2$ and ${\mathrm{\lambda }}_3$ are emitted due to the atomic transitions $\mathrm{C}$ to $\mathrm{B}, \mathrm{B}$ to $\mathrm{A}$ and $\mathrm{C}$ to $\mathrm{A}$ respective then which of the following relations is corret

The wavelengths of photons emitted by electron transform between two similar levels in $\mathrm{H}$ and ${\mathrm{He}}^{+}$ are ${\mathrm{\lambda }}_1$ and ${\mathrm{\lambda }}_2$ respectively. Then :-

No. of visible lines when an electron returns from $5^{\text{th }}$ orbit to ground state in $\mathrm{H}$ spectrum :-