Atomic Structure

In the photoelectric emission, the energy of the emitted electron is:

The Bohr orbit of the hydrogen atom ( $n=1$ ) is $0.530 \mathop {\rm{A}}\limits^{\rm{o}} $. The radius of the first excited state orbit in $\mathop {\rm{A}}\limits^{\rm{o}} $ is:

The frequency of photon which is emitted during a transition of electron of $\mathrm{He}^{+}$ion from fifth energy level to third energy level will be:

Which of the following statement is correct?

A certain gas absorbs photon of wavelength $4.0 \times 10^{-7} \mathrm{~m}$ and emits radiation at two wavelengths. If one of the emissions occurs at $7.5 \times 10^{-7} \mathrm{~m}$, what is the wavelength at which the second emission occu...

A certain orbital having 2 angular nodes and no radial nodes is:

The number of electrons with azimuthal quantum numbers $l=1$ and $l=2$ for Cr in the ground state electronic configurations are respectively.
[Given: $\mathrm{Cr}(\mathrm{Z}=24)$ ]

The ratio of the difference between the radii of $3^{\text {rd }}$ and $4^{\text {th }}$ orbits of the $\mathrm{He}^{+}$and those of $\mathrm{Li}^{2+}$ is:

Two subatomic particles 1 and 2, with the same kinetic energies have their de- Broglie wavelengths as $\lambda_1 & \lambda_2$ and masses as 3 m and 6 m respectively.

Determine the ratio $\lambda_1: \lambda_2$.

A statement of Assertion followed by a statement of Reason is given.
Choose the correct answer out of the following options.
Assertion : Energy of \(2 \mathrm{~s}\) orbital of Hydrogen is less than the energy of the \(2 \mathrm{~s}\) orbita...

The mass number of an element \(\mathrm{X}\) is 175 with 104 neutrons in its nucleus. Into which one of the following orbitals will the last electron enter?

Given below are 4 subatomic particles travelling with the same velocity "v". Which of them will have the shortest wavelength?
\([A]=\text { Proton }[B]=\text { Neutron. }[C]=\text { Alpha particle. }[D]=\text { Electron. }\)

What is the wave number (Units \(\mathrm{cm}^{-1}\)) of the longest wave length transition in the Balmer series of Hydrogen spectrum? \(Z=1 \text { for } H\)

What are the Principal & Azimuthal quantum number values of the valence electrons in tripositive Lutetium?

The ratio of the first three radii of Bohr's atom is:

The correct sequence of filling of electrons in \(n=6\) is:

The energy of an electron in the ground state of Hydrogen atom is \(-2.18 \times 10^{-18} \mathrm{~J}\). What would be the energy associated with the second excited state of \(\mathrm{Li}\) ?

A proton having mass equal to \(1.66 \times 10^{-27} \mathrm{~kg}\) is accelerated to one tenth of the velocity of light. If its velocity can be measured to an accuracy of \(\pm 2 \%\), what would be the uncertainty in its position?

The ion that is isoelectronic with \(\mathrm{CO}\) is

Bohr's radius of 2 nd orbit of \(\mathrm{Be}^{3+}\) is equal to that of

The Paschen series of hydrogen spectrum lies in which region?

The spectrum of He\(^+\) is similar to

\(\mathrm{O^{2-},F^-,Mg^{2+},Al^{3+},O_2,F_2}\). How many of the species given above isoelectronic?

Minimum number of nodes are present in

The Lyman series of hydrogen spectrum lies in which region

Which of the following series of transitions in the spectrum of hydrogen atom fall in visible region?

The total number of nodes are given by

Mg\(^{2+}\) is isoelectronic with

A body of mass 10 mg is moving with a velocity of 100 ms\(^{-1}\). The wavelength of de-Broglie wave associated with it would be
(\(h=6.63\times10^{-34}\) Js)