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Questions asked by sharmaaparna1
Questions
282
questions
0
answers selected
An argon laser emits blue light with a wavelength of 488.0nm. How many photon are emitted by this laser in 2.00 sec,operating a power of 515 milliwatts?(one watt = 1J$S^{-1}$)
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
medium
q170
asked
Feb 6, 2014
1
answer
The energy required for the ionisation of a certain atom is $3.44\times10^{-18}J$. The absorption of a photon of unknown wavelength ionises the atom and ejects an electron with velocity $1.03\times10^6$ m/sec. Calculate the wavelength of the incident radiation.
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
medium
q169
asked
Feb 5, 2014
1
answer
Calculate the wavelength of the first line and the series limit for the Lyman series for hydrogen.(Series limit is for the case when $n_2 = \infty)$
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
medium
q168
asked
Feb 5, 2014
1
answer
An electron difraction experiment was performed with a beam of electrons accelerated by a potential difference of 10.0kV.What is the wavelength of the electron beam?(1KV = 1000V = 1000eV for the electron)
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
easy
q167
asked
Feb 5, 2014
1
answer
A proton is accelerated to one tenth of the velocity of light. Suppose velocity can be measured with a precision of $\pm1\%$, what can be the uncertainity in its position?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
medium
q166
asked
Feb 5, 2014
1
answer
The speed of a certain proton is $4.5\times10^5m$ If the uncertainity is to be reduced to 0.01percent, what uncertainity in its location must be tolerated?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
medium
q165
asked
Feb 5, 2014
1
answer
Two particles A and B are in motion . if the wavelength associated with particle A is $5\times10^{-8}$m.Calculate the wavelength associated with particle B if its momentum is half of A.
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
easy
q164
asked
Feb 5, 2014
1
answer
Calculate the wavelength of a helium atom whose speed is equal to root mean square speed at 293 K $(rms = \sqrt{3RT/m})$
sat
chemistry
atomic-structure
jeemain
physical-chemistry
class11
unit2
quantum-mechanical-model
medium
q163
asked
Feb 4, 2014
1
answer
The wavelength of $\beta$ line of the Balmer Series is $4815 A^{\large\circ}$. What is the wavelength of $\alpha$ line of balmer Series of the same atom?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
medium
q162
asked
Feb 4, 2014
1
answer
AIR services on vividh Bharti is transmitted on 219m band.What is its transmission frequency in Hertz.
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
easy
q161
asked
Feb 4, 2014
1
answer
A certain laser transition emits $6.37\times10^{15}$ quants per second per square meter. Calculate the power out put in joule per square metre per second. Given $\lambda$ = 632.8 nm.
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
medium
q160
asked
Feb 4, 2014
1
answer
A photon of 300nm is absorbed by a gas and then re-emits two photons. One re-emitted photon has wavelength 496nm. Calculate energy of other photon re-emitted out.
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
easy
q159
asked
Feb 4, 2014
1
answer
The dissociation energy of $H_2$ is 430.53 KJ$mol^{-1}$. If $H_2$ is exposed to radiation energy of wavelength 253.7nm, what % of radiant energy will be converted into kinetic energy ?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
difficult
q158
asked
Feb 1, 2014
1
answer
A certain dye absorbs light of $\lambda = 4530 A^{\large\circ}$ and then fluorescence light of $5080 \;A^{\large\circ}$ Assuming that under given conditions $47\%$ of the absorbed energy is re-emmited out as fluorescence, Calculate the ratio of Quantum emitted out to the no. of quanta absorbed
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
difficult
q157
asked
Feb 1, 2014
1
answer
$O_2$ undergoes photochemical dissociation into one normal oxygen atom and one oxygen atom, 1.967 eV more energetic than normal. The dissociation of $O_2$ into two normal atoms of oxygen requires 498 KJ$mol^{-1}$.what is the maximum wavelength effective for photochemical dissociation of $O_2$ ?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
q156
difficult
asked
Feb 1, 2014
1
answer
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?
sat
chemistry
atomic-structure
jeemain
physical-chemistry
class11
unit2
bhor's-model
medium
q155
asked
Jan 31, 2014
1
answer
Find out the energy of H atom in first excitation state. The value of permitivity factor $4\pi E_{\large\circ} = 1.11264\times10^{-10} C^2N^{-1}m{-2}$
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
medium
q154
asked
Jan 31, 2014
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
sat
chemistry
atomic-structure
jeemain
physical-chemistry
class11
unit1
bhor's-model
medium
q153
asked
Jan 31, 2014
1
answer
What hydrogen like ion has the wavelength difference between the first lines of Balmer and Lyman series equal to 59.3 nm? $R_H = 109678 cm^{-1}$
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
difficult
q152
asked
Jan 31, 2014
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 $\lambda_o$.
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
difficult
q151
asked
Jan 30, 2014
1
answer
Calculate the largest wavelength which can remove the electron from 1 Bohr's orbit. Given $E_1$ = 13.6 eV
sat
chemistry
atomic-structure
jeemain
physical-chemistry
class11
unit2
bhor's-model
medium
q151
asked
Jan 30, 2014
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?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
difficult
q150
asked
Jan 28, 2014
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?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
difficult
q149
asked
Jan 28, 2014
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.
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
difficult
q148
asked
Jan 28, 2014
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.
sat
chemistry
atomic-structure
jeemain
physical-chemistry
class11
unit2
quantum-mechanical-model
medium
q147
asked
Jan 28, 2014
1
answer
If the electron energy is -3.4 eV , Find the principal quantum number of H-atom?
sat
chemistry
atomic-structure
jeemain
physical-chemistry
class11
unit2
quantum-mechanical-model
medium
q146
asked
Jan 24, 2014
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.
jeemain
chemistry
physical-chemistry
class11
unit-2
atomic-structure
bhor's-model
medium
q145
asked
Jan 24, 2014
1
answer
An ion $Mn^{a+}$ has the magnetic moment equal to 4.9bm. What is the value of a ?
sat
chemistry
atomic-structure
jeemain
physical-chemistry
class11
unit2
quantum-mechanical-model
easy
q144
asked
Jan 24, 2014
1
answer
An oil drop has $8.01\times10^{-19}$ C charge. Calculate the number of electrons in this drop.
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
atomic-models-(rutherford-and-thomson)
easy
q143
asked
Jan 23, 2014
1
answer
The wavelength of $m^{th}$ line Balmer series for an orbital is $4103 A^{\large\circ}$. What is the value of $m$?
jeemain
chemistry
physical-chemistry
class11
atomic-structure
bhor's-model
unit2
medium
q142
asked
Jan 23, 2014
1
answer
Calculate the number of waves made by a Bohr's electron in one complete revolution in its 3rd orbit of H-atom
jeemain
chemistry
physical-chemistry
atomic-structure
bhor's-model
unit2
class11
difficult
q141
asked
Jan 23, 2014
1
answer
(iii) Find the transpose of the matrix \begin{bmatrix} -1 & 5 & 6 \\ \sqrt{3} & 5 & 6 \\ 2 & 3 & -1 \end{bmatrix}
cbse
class12
bookproblem
ch3
sec3
q1
q1-3
p88
easy
sec-a
math
asked
Mar 1, 2013
1
answer
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