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Recent questions in Atomic Structure

Questions >> JEEMAIN and NEET >> Chemistry >> Atomic Structure

Atomic radius is of the order of $10^{-8} cm$ and nuclear radius is of the order of $10^{-13}$ cm. calculate what fraction of atom is occupied by nucleus?

asked Jan 31, 2014 by sharmaaparna1

1 answer

Find out the energy of H atom in first excitation state. The value of permitivity factor $4\pi E_{\large\circ} = 1.11264\times10^{-10} C^2N^{-1}m{-2}$

asked Jan 31, 2014 by sharmaaparna1

1 answer

What is the principal quantum no. of H-atom Orbital if the electron energy is -3.4 eV ? also report the angular momentum of electron

asked Jan 31, 2014 by sharmaaparna1

1 answer

What hydrogen like ion has the wavelength difference between the first lines of Balmer and Lyman series equal to 59.3 nm? $R_H = 109678 cm^{-1}$

asked Jan 31, 2014 by sharmaaparna1

1 answer

The photo electric emission requires a threshold frequency $V_o$. For a certain metal $\lambda_1$ = 2200 $\overset{\circ}{A}$ and $\lambda_2$ = 1900 $\overset{\circ}{A}$ produce electrons with a maximum kinetic energy $KE_1$ and $KE_2$. If $KE_2 = 2KE_1$. Calculate $V_o$ and corresponding $\lambda_o$.

asked Jan 30, 2014 by sharmaaparna1

1 answer

Calculate the largest wavelength which can remove the electron from 1 Bohr's orbit. Given $E_1$ = 13.6 eV

asked Jan 30, 2014 by sharmaaparna1

1 answer

To what series does the spectral lines of atomic hydrogen belong if its wave number is equal to the difference between the wave numbers of the following two lines of the Balmer series 486.1 and 410.2 nm?

asked Jan 28, 2014 by sharmaaparna1

1 answer

A series of lines in the spectrum of atomic H lies at wavelengths 656.46 , 486.27 , 434.17 , 410.29 mm. what is the wavelength of next line in this series?

asked Jan 28, 2014 by sharmaaparna1

1 answer

A hydrogen like atom (atomic No. Z) is in a higher excited state of quantam number n. This excited atom can make a transition to the first excited state by successively emitting two photons of energies 10.20 eV and 17.00 eV respectively. alternatively the atom from the same excited state can make a transition to the second excited state by successively emitting two photons of energy 4.25eV and 5.95 eV respectively. Determine the values of n and Z.

asked Jan 28, 2014 by sharmaaparna1

1 answer

A compound of Vanadium has a magnetic moment of 1.73 Bm. Work out the electric configuration of the Vanadium ion in the compound.

asked Jan 28, 2014 by sharmaaparna1

1 answer

If the electron energy is -3.4 eV , Find the principal quantum number of H-atom?

asked Jan 24, 2014 by sharmaaparna1

1 answer

The velocity of an electron in a certain Bohr's orbit of H-atom bears the ratio 1:275 to the velocity of light. Then find the quantum numbers (n) of orbit.

asked Jan 24, 2014 by sharmaaparna1

1 answer

An ion $Mn^{a+}$ has the magnetic moment equal to 4.9bm. What is the value of a ?

asked Jan 24, 2014 by sharmaaparna1

1 answer

An oil drop has $8.01\times10^{-19}$ C charge. Calculate the number of electrons in this drop.

asked Jan 23, 2014 by sharmaaparna1

1 answer

The wavelength of $m^{th}$ line Balmer series for an orbital is $4103 A^{\large\circ}$. What is the value of $m$?

asked Jan 23, 2014 by sharmaaparna1

1 answer

Calculate the number of waves made by a Bohr's electron in one complete revolution in its 3rd orbit of H-atom

asked Jan 23, 2014 by sharmaaparna1

1 answer

Find out the number of angular nodes in the orbital to which the last electron of Cr enter.

asked Jan 17, 2014 by sreemathi.v

1 answer

Given that, $r_{(n+1)}-r_n=r_{(n-1)}$,where $r_n,r_{n-1}$ and $r_{(n+1)}$ are Bohr's radius for H-atom in $n^{th},(n-1)^{th}$ and $(n+1)^{th}$ shell respectively.

asked Jan 17, 2014 by sreemathi.v

1 answer

Find out the degeneracy of hydrogen atom that has the energy equal to $-\large\frac{R_H}{9}$.($R_H$-Rydberg constant).

asked Jan 17, 2014 by sreemathi.v

1 answer

The magnetic moment of a transition metal ion is $\sqrt{15}$BM.Find out the number of unpaired electrons in it

asked Jan 17, 2014 by sreemathi.v

1 answer

Magnetic moment of $A^{3+}$ ion is $5.48\times 10^{-23}J/T$.Find out the number of unpaired electrons in it.($9.27\times 10^{-24}J/T$=1BM)

asked Jan 17, 2014 by sreemathi.v

1 answer

Find the ratio of energy of a photon of $2000A^{\large\circ}$ wavelength radiation to that of $4000A^{\large\circ}$ radiation.

asked Jan 17, 2014 by sreemathi.v

1 answer

The electron in $Li^{2+}$ ions are excited from ground state by absorbing $8.4375R_h$ energy/electron.How much emission lines are expected during de-excitation of electrons to ground state ?

asked Jan 17, 2014 by sreemathi.v

1 answer

What is the ratio of wavelength of II line of Balmer series and I line of Lyman series

asked Jan 17, 2014 by sreemathi.v

1 answer

H-atoms in ground state (13.6eV) are excited by monochromatic radiations of photon of energy 12.1eV. Find the number of spectral lines emitted in H atom.

asked Jan 17, 2014 by sreemathi.v

1 answer

The ionization energy of a H like Bohr's atom is 4 Rydberg.Calculate the wavelength radiated when electron jumps from the first excited state to ground state.

asked Jan 17, 2014 by sreemathi.v

1 answer

Calculate the uncertainty in velocity of an electron if the uncertainty in its position is of the order of $1A^{\large\circ}$

asked Jan 17, 2014 by sreemathi.v

1 answer

The $\lambda$ of $H_{\alpha}$ line of Balmer series is $6500A^{\large\circ}$.What is the $\lambda$ of $H_{\beta}$ line of Balmer series?

asked Jan 17, 2014 by sreemathi.v

1 answer

If uncertainties in the measurement of position and momentum of an electron are equal,calculate uncertainty in the measurement of velocity.

asked Jan 17, 2014 by sreemathi.v

1 answer

The maximum kinetic energy of photoelectrons ejected from a metal,when it is irradiated with radiation of frequency $2\times 10^{14}s^{-1}$ is $6.63\times 10^{-20}J$.The threshold frequency of metal is

asked Jan 17, 2014 by sreemathi.v

1 answer

Photoelectrons are liberated by ultraviolet light of wavelength $3000A^{\large\circ}$ from a metallic surface for which the photoelectric threshold is 4000$A^{\large\circ}$.Calculate De-Broglie wavelength of electrons emitted with maximum kinetic energy.

asked Jan 17, 2014 by sreemathi.v

1 answer

The binding energy of electrons in a metal is 250KJ/mol.What is the threshold frequency of metal ?

asked Jan 17, 2014 by sreemathi.v

1 answer

Wavelength of the $K_{\alpha}$ characteristic X-rays of iron and potassium are $1.93\times 10^{-8}$ are $3.737\times 10^{-8}cm$ respectively.What is the atomic number and name of the element for which characteristic $K_{\alpha}$ wavelength is $2.289\times 10^{-8}cm$.

asked Jan 17, 2014 by sreemathi.v

1 answer

The minimum energy required to overcome the attractive forces between electron and the surface of Ag metal is $7.52\times 10^{-19}J$.What will be the maximum kinetic energy of electron ejected out from Ag.Which is being exposed to uv light of $\lambda=360A^{\large\circ}$?

asked Jan 17, 2014 by sreemathi.v

1 answer

Calculate the uncertainty in velocity of a cricket ball (mass=0.15Kg) if its uncertainty in position is of the order of $1A^{\large\circ}$

asked Jan 17, 2014 by sreemathi.v

1 answer

Energy required to stop the ejection of electrons from $Cu$ plate is 0.24eV.Calculate the work function when radiations of $\lambda=253.7nm$ strikes the plate.

asked Jan 17, 2014 by sreemathi.v

1 answer

An electron has a total energy of 2MeV.Calculate the effective mass of the electron in Kg and its speed .Assume rest mass of electron 0.511MeV

asked Jan 16, 2014 by sreemathi.v

1 answer

Two hydrogen atoms collide head on and end up with zero kinetic energy.Each atom then emits a photon of wavelength 121.6nm.Which transition leads to this wavelength ?How fast were the hydrogen atoms traveling before collision?$R_H=1.097\times 10^7m^{-1}$ and $m_H=1.67\times 10^{-27}Kg$

asked Jan 16, 2014 by sreemathi.v

1 answer

With what velocity must an electron travel so that its momentum is equal to that of a photon of wavelength $\lambda=5200A^{\large\circ}$?

asked Jan 16, 2014 by sreemathi.v

1 answer

Calculate momentum of radiations of wavelength 0.33nm

asked Jan 16, 2014 by sreemathi.v

1 answer

Calculate the angular frequency of an electron occupying the second Bohr's orbit of $He^+$ ion.

asked Jan 16, 2014 by sreemathi.v

1 answer

Find the quantum no 'n' corresponding to the excited state of $He^+$ ion if on transition to the ground state that ion emits two photons in succession with wavelength 108.5 and 30.4nm

asked Jan 16, 2014 by sreemathi.v

1 answer

Calculate the wavelength emitted during the transition of electron in between two levels of $Li^{+2}$ ion whose sum is 4 and difference is 2.

asked Jan 16, 2014 by sreemathi.v

1 answer

A stationary $He^+$ ion emitted a photon corresponding to the first line $(H_{\alpha})$ of the Lyman series .That photon liberated a photo electron from a stationary H atom in ground state.What is the velocity of photo electron?$R_H=109678cm^{-1}$

asked Jan 16, 2014 by sreemathi.v

1 answer

The angular momentum of an electron in a Bohr's orbit of H-atom is $4.2178\times 10^{-34}Kg-m^2/s$.Calculate the spectral line emitted when electron falls from this level to next lower level.

asked Jan 16, 2014 by sreemathi.v

1 answer

Calculate the uncertainty in velocity of a cricket ball (mass=0.15Kg) if its uncertainty position is of the order of $1A^{\large\circ}$

asked Jan 16, 2014 by sreemathi.v

1 answer

The vapours of Hg absorb some electrons accelerate by a potential difference of 4.5volts as a result of which light is emitted .If the full energy of single incident electron is supposed to be converted into light emitted by single Hg atom,find the wave number $\big(\large\frac{1}{\lambda}\big)$ of the light.

asked Jan 16, 2014 by sreemathi.v

1 answer

An electron beam can undergo diffraction by crystals.Through what potential should a beam of electrons be accelerated so that its wavelength becomes equal to $1.54A^{\large\circ}$?

asked Jan 16, 2014 by sreemathi.v

1 answer

Energy of the electron in H-atom is 1.50 times as much as energy as the minimum required for its escape (13.6eV) from the atom.Calculate the wavelength of the emitted electron.

asked Jan 16, 2014 by sreemathi.v

1 answer

When a certain metal was irradiated with light of frequency $1.6\times 10^{16}Hz$,the photoelectrons emitted had twice the kinetic energy as did photoelectrons emitted when the same metal was irradiated with light of frequency $1.0\times 10^{16}$Hz.Calculate $V_0$(threshold frequency) for the metal.

asked Jan 16, 2014 by sreemathi.v

1 answer

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