Atoms practice · Medium

In Bohr’s model, if the atomic radius of the first orbit is ${r_0}$, then the radius of the fourth orbit is

White X-rays are called white due to the fact that

${H^ + },\,\,H{e^ + }\,\,\,\mathrm{and}\,\,\,{O^{ + + }}$ ions having same kinetic energy pass through a region of space filled with uniform magnetic field B directed perpendicular to the velocity of ions. The masses of the ions ${H^ + },\,\,H{e^ + }\,\,\,\mathrm{and}\,\,\,{O^{ + + }}$ are respectively in the ratio 1:4:16. As a result
A)${H^ + }$ ions willbedeflected most
B) ${O^{ + + }}$ ions willbedeflectedleast
C) $H{e^ + }\,\,\,\mathrm{and}\,\,\,{O^{ + + }}$ ions will suffer samedeflection
D) All ions will suffer thesamedeflection

Statement-1: When hydrogen atom is raised from the ground state to an excited state the kinetic energy increases.
Statement-2: The velocity of electron in a quantum state is inversely proportional to the quantum number of the state.

In a coolidge tube experiment, the minimum wavelength of the continuous X-ray spectrum equal to 66.3 pm.

An electron moving around the nucleus with an angular momentum $l$ has a magnetic moment

Statement I: The different lines of emission spectra (like Lyman,Balmer, etc) of atomic hydrogen gas are produced by different atoms.
Statement II: The sample of atomic hydrogen gas consists of millions of atoms.

Hydrogen atom is excited from ground state to another state with principal quantum number equal to $\mathrm{4}$. Then the number of spectral lines in the emission spectra will be

The continuous X-rays spectrum produced by an X-ray machine at constant voltage has

An electron is accelerated through a potential difference of 64 volts. What is the de-Broglie wavelength associated with it? To which part of the electromagnetic spectrum does this value of wavelength correspond?

An electron in the hydrogen atom jumps excited state $n$ to the ground state. The wavelength so emitted illuminates a photosensitive material having work function $2.75\;eV.$ If the stopping potential of the photoelectron is $10\;eV,$ then the value of $n$ is

If accelerating voltage of $\mathrm{X}$-ray tube is $13 \mathrm{~kV}$ find minimum wavelength of $\mathrm{X}$-ray,

If the series limit of Lymen series for Hydrogen atom is equal to the series limit of Balmer series for a hydrogen like atom, then atomic number of this hydrogen like atom will be

The ratio between total acceleration of the electron in singly ionized helium atom and hydrogen atom (ground state) is

If the ionization potential of helium atom is 24.6 volt, the energy required to ionize it will be

What will be the angular momentum of an electron, if energy of this electron in $H$-atom is $- 1.5\,\,eV$ (in $J$-$s$)

If ${\lambda _1}$ and ${\lambda _2}$ are the wavelengths of characteristic X-rays and gamma rays respectively, then the relation between them is

According to Bohr’s theory, the ratio of the times taken by the electron in a hydrogen atom to complete one revolution in orbits corresponding to ground and first excited state is.

In Raman effect, Stoke’s lines are spectral lines having

The ratio of the kinetic energy to the total energy of an electron in a Bohr orbit is

For principal quantum number $n = 3$, the possible values of orbital quantum number $'l'$ are

For characteristic $X$-ray of some material

An electron in hydrogen atom first jumps from second excited state to first excited state and then from first excited state to ground state. Let the ratio of wavelength, momentum and energy of photons emitted in these two cases be $a, b$ and $c$ respectively. Then,

Consider an electron in the ${n^{\mathrm{th}}}$ orbit of a hydrogen atom in the Bohr model. The circumference of the orbit can be expressed in terms of the de Broglie wavelength $\lambda$ of that electron as

The maximum wave length of bracket series of hydrogen atom will be [in ${A^0}$ ]

Statement I: The ionisation potential of hydrogen is found to be $13.6 \mathrm{~eV}$, the ionisation potential of doubly ionised lithium is $122.4 \mathrm{~eV}$.
Statement II: Energy in the $n$th state of hydrogen atom is $E_n=-\frac{13.6}{n^2}$.

To explain his theory, Bohr used

Suppose an electron is attracted towards the origin by a force$\frac{k}{r}$ where $\mathrm{'k'}$ is a constant and $\mathrm{'r'}$ is the distance of the electron from the origin. By applying Bohr model to this system, the radius of the ${\mathrm{n}^{\mathrm{th}}}$ orbital of the electron is found to be $\mathrm{'}{\mathrm{r}_\mathrm{n}}^\prime$ and the kinetic energy of the electron to be $\mathrm{'}{\mathrm{T}_\mathrm{n}}^\prime$. Then which of the following is true

Which of the following parameters is same for electron in all hydrogen like atoms and ions in their ground states?

The significant result deduced from the
Rutherford's scattering experiment is that