Recent questions in Atoms

Explain the origin of spectral lines of hydrogen spectrum on basis of Bohr's theory.

asked Jul 20, 2017 by pady_1

2 answers

Obtain the relation for frequency of spectral lines emitted from hydrogen atoms.

asked Jul 20, 2017 by pady_1

1 answer

Calculate the energy level of an electron in $n^{th}$ orbit or derive an equation for the energy of

asked Jul 20, 2017 by pady_1

1 answer

What is the minimum energy that must be given to a H- atom in ground state so that it can emit an $H_{\gamma}$ in Balmer series? If the angular momentum of the system is conserved what would be the angular momentum of such $H_{\gamma}$ proton ?

asked Jul 8, 2016 by meena.p

1 answer

A potential difference applied to an - ray tube is $5kv$ and the current through it is $3.2 \;mA$ Then the number of electrons striking the target per second is

asked Jul 8, 2016 by meena.p

1 answer

An energy of $24.6\;ev$ is required to remove one of the electrons in (ev) is required to remove both the electrons from a neutral helium atom is

asked Jul 8, 2016 by meena.p

1 answer

If an $\alpha$ particle collides head on with a nucleus , What is impact parameter?

asked Jul 8, 2016 by meena.p

1 answer

During x- ray formation if voltage is increased,

asked Jul 8, 2016 by meena.p

1 answer

What would be the radius of second orbit of $He^{+}$ ion ?

asked Jul 8, 2016 by meena.p

1 answer

The size of the atom is proportional to

asked Jul 8, 2016 by meena.p

1 answer

An electron makes a transition from orbit $n=4$ to the orbit n=2 of a hydrogen atom. What is the wave length of the emitted radiation? (R= Rydberg's constant}

asked Jul 8, 2016 by meena.p

1 answer

An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r. The coulomb force $\overrightarrow{F}$ between the two is :

asked Jul 8, 2016 by meena.p

1 answer

Hydrogen atoms are excited from ground state to the state of principle quantum number 4, Then the no of spectral lines observed will be

asked Jul 8, 2016 by meena.p

1 answer

Name the spectral series of hydrogen spectrum lying in the infrared region .

asked Jul 8, 2016 by meena.p

1 answer

How much is the radius of Bohr's innermost orbit ?

asked Jul 8, 2016 by meena.p

1 answer

Write an empirical relation for parchen series lies of hydrogen spectrum

asked Jul 8, 2016 by meena.p

1 answer

What is the angle of scattering for zero impact parameter ?

asked Jul 8, 2016 by meena.p

1 answer

Name the series of hydrogen spectrum which has least wave length

asked Jul 8, 2016 by meena.p

1 answer

When is $H_{\alpha}$ line of the Balmer series in the emission spectrum of hydrogen atom obtained ?

asked Jul 8, 2016 by meena.p

1 answer

In which series of hydrogen spectrum , the transition involve the largest changes of energy ?

asked Jul 8, 2016 by meena.p

1 answer

The energy of an electron in an excited hydrogen atom is $-3.4 \;ev$ calculate the angular momentum of the electron according to Bohr's theory .

asked Jul 8, 2016 by meena.p

1 answer

When electron falls from a higher energy to a lower energy level , the difference in the energies appear in the form of electromagnetic radiation . Why cannot it be emitted as other form of energy?

asked Jul 8, 2016 by meena.p

1 answer

The mass of a H- atom is less than the sum of the mass of a proton and electron , why is this ?

asked Jul 8, 2016 by meena.p

1 answer

The simple Bohr model is not applicable to $_2He^4$ atom because

asked Jul 8, 2016 by meena.p

1 answer

Let $E_n=\large\frac{-1me^4}{8\in_0^2 n^2h^2}$ be the energy of the nth level of H- atom . If all the H- atoms are in the ground state and radiation of frequency $(E_2-E_1) /h$ falls on it ,

asked Jul 8, 2016 by meena.p

1 answer

The Balmer series for the H- atom can be observed

asked Jul 8, 2016 by meena.p

1 answer

The Bohr model for the Spectra of a H-atom

asked Jul 8, 2016 by meena.p

1 answer

Consider aiming a beam of free electron towards free protons. when they scatter , an electron and a proton cannot combine to produce a H-atom .

asked Jul 8, 2016 by meena.p

1 answer

An ionized H- molecules consists of an electron and two protons. The proton are separated by a small distance of the order of any strom .In the ground state ,

asked Jul 7, 2016 by meena.p

1 answer

A set of atoms in an excited state decays

asked Jul 7, 2016 by meena.p

1 answer

Two H atoms in the ground state collide inelastically . The maximum amount by which their combined kinetic energy is reduced is

asked Jul 7, 2016 by meena.p

1 answer

$O_2$ molecules consists of two oxygen atoms. In the molecule , nuclear force between the nuclei of the two atoms

asked Jul 7, 2016 by meena.p

1 answer

For the ground state, the electron in th H- atom has an angular momentum = h , according to the simple Bohr model. Angular momentum is a vector and hence there will be infinitely many orbits with the vector pointing in all possible direction . In actuality this is not true.

asked Jul 7, 2016 by meena.p

1 answer

The Simple Bohr model cannot be directly applied to calculate the energy levels of an atom with many electrons . This is because

asked Jul 7, 2016 by meena.p

1 answer

The binding energy of a H-atom , considering an electron moving around a fixed nuclei is $B= \large\frac{-me^4}{8n^2\in_0 h^2}$If one decides to work in a frame of reference where the electron is at rest , the proton would be around it. By similar arguments, the binding energy would be , $B=\large\frac{-Me^4}{8n^2\in_0^2h^2}$ This last expression is not correct because ,

asked Jul 6, 2016 by meena.p

1 answer

Taking the Bohr radius as $a_0 = 53 \;pm, $ the radius of $Li^{++}$ ion in its ground state , on the basic of Bohr's model will be about

asked Jul 6, 2016 by meena.p

1 answer

The total energy of electron in the first electron state of hydrogen atom is about $-3.4\;ev$ What is the kinetic energy of electron in this state ?

asked Jul 6, 2016 by meena.p

1 answer

Is the average angle of deflection of $ \alpha$ particles by a thin gold foil predicted by Thomson's model much less , about the same or much greater than that predicted by Rutherford's atom model ?

asked Jul 6, 2016 by meena.p

1 answer

In accordance with the Bohr's model find the quantum number that characterizes the earth revolution around the sun in an earth orbit of radius $1.5 \times 10^{11}\;m$ with orbital speed $3 \times 10^4 \;ms^{-1}$

asked Jul 6, 2016 by meena.p

1 answer

A $12.5\;ev$ electron beam is used to bombard gaseous hydrogen at room temperature .What series of wave length will be emitted ?

asked Jul 6, 2016 by meena.p

1 answer

The radius of inner most electron orbit of a hydrogen atom is $5.3 \times 10^{-11}\;m $ what are the radii of $n=2$ and $n=3$ orbits?

asked Jul 6, 2016 by meena.p

1 answer

Using Bohr's model , calculate the orbital period of the electron in a hydrogen atom in the $n= 1,2$ and $3$ levels

asked Jul 6, 2016 by meena.p

1 answer

Using the Bohr's model , calculate the speed of the electron in a hydrogen atom in the $n= 1,2$ and 3 levels

asked Jul 6, 2016 by meena.p

1 answer

A hydrogen atom initially in the ground level absorbs a photon, which excites it to $n=4$ level. Determine the wave length and frequency of photon .

asked Jul 6, 2016 by meena.p

1 answer

The ground state energy of hydrogen atom is $-13.6 ev$ what are the kinetic and potential energies of the electron of the electron in this state ?

asked Jul 5, 2016 by meena.p

1 answer

A difference of $2.3 \;ev$ separates two energy levels in an atom. What is the frequency of radiation emitted when the atom transmit from the upper level to the lower level .

asked Jul 5, 2016 by meena.p

1 answer

What is the shortest wave length present in the paschen series of spectral lines ?

asked Jul 5, 2016 by meena.p

1 answer

Suppose you are given a chance to repeat the alpha particle scattering experiment using a thin sheet of solid hydrogen in place of gold foil (hydrogen is a solid at temperature below 14 k) What results do you except ?

asked Jul 5, 2016 by meena.p

1 answer

The positively charged part of the atom possesses most of the mass of the atom in __________

asked Jul 5, 2016 by meena.p

1 answer

An atom has a nearly continuous mass distribution in but has a highly non uniform mass distribution in ____

asked Jul 5, 2016 by meena.p

1 answer

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